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他回答了问题：
答：继电器是一种根据某种输入信号的变化，而接通或断开控制电路，实现自动控制和保护电力拖动系统的电器。输入的信号可以是电压，电流等电量，也可以是转速，时间，温度和压力等非电量。继电器一般不是用来直接控制信号较强电流的主电器，而是通过接触器或其它电器对主电路进行控制。
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答：飞雕、公牛等等品牌挺好的，我们这都用这两牌子的。
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答：海信是国内市场最早研发变频空调的，而且获得相当多的专利，海信和科龙现在是一家，虽说是两个品牌，但是，技术支持是共享的，我想你应该会好好考虑的
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&技术支持：008网络查看原图 - Powerby 站酷（ZCOOL）From Wikipedia, the free encyclopedia
Iron weights up to 50
depicted in Dictionnaire encyclopédique de l'épicerie et des industries annexes.
To help compare different , the following lists describe various
levels between 10-40
and 1053 kg.
SI multiples for gram (g)
Submultiples
microgram (mcg)
megagram ()
Common prefixes are in bold face.
The table below is based on the
(kg), the base unit of mass in the
(). The kilogram is the only standard unit to include an
(kilo-) as part of its name. The
(10-3 kg) is an SI derived unit of mass. However, the names of all SI mass units are based on gram, rather than on kilogram; thus 103 kg is a megagram (106 g), not a "kilokilogram".
(t) is a SI-compatible unit of mass equal to a megagram, or 103 kg. The unit is in common use for masses above about 103 kg and is often used with SI prefixes.
Other units of mass are also in use. Historical units include the , the , the , and the .
For subatomic particles, physicists use the mass equivalent to the energy represented by an
(eV). At the atomic level, chemists use the mass of one-twelfth of a carbon-12 atom (the ). Astronomers use the
Unlike other physical quantities, mass-energy does not have an a priori expected minimal quantity, as is the case with
or , or an observed basic quantum as in the case of .
allows for the existence of photons with arbitrarily low energies. Consequently, there can only ever be an experimental lower bound on the mass of a supposed in the case of the photon, this confirmed lower bound is of the order of 3×10-27 eV = 10-62 kg.
10×10-62 kg
of the energy of the lightest photon detected[]
4.2×10-40 kg
of the energy of a
at the peak of the spectrum of the
(0.235 meV/c2)[]
1.8×10-36 kg
One eV/c2, the
3.6×10-36 kg
, upper limit on mass (2 eV/c2)
9.11×10-31 kg
(511 keV/c2), the lightest
with a measured nonzero
3.0–5.5×10-30 kg.
() (1.7–3.1 MeV/c2)
1.9×10-28 kg
(106 MeV/c2)
yoctogram (yg)
1.661×10-27 kg
() or dalton (Da)
1.673×10-27 kg
(938.3 MeV/c2)
1.674×10-27 kg
atom, the lightest atom
1.675×10-27 kg
(939.6 MeV/c2)
1.2×10-26 kg
atom (6.941 u)
3.0×10-26 kg
(18.015 u)
8.0×10-26 kg
atom (47.867 u)
1.1×10-25 kg
atom (63.546 u)
1.6×10-25 kg
(91.2 GeV/c2)
3.1×10-25 kg
(173 GeV/c2), the heaviest known
3.2×10-25 kg
molecule (194 u)
3.5×10-25 kg
-208 atom, the heaviest stable
4.9×10-25 kg
-294 atom, the heaviest nuclide known
zeptogram (zg)
1.2×10-24 kg
molecule (720 u)
1.4×10-23 kg
, a small protein (8.6 )
5.5×10-23 kg
(median size of roughly 300 amino acids ~= 33 kDa)
1.1×10-22 kg
molecule in blood (64.5 kDa)
attogram (ag)
1.65×10-21 kg
Double-stranded
molecule consisting of 1,578
(995,000 )
4.3×10-21 kg
Prokaryotic
7.1×10-21 kg
Eukaryotic
7.6×10-21 kg
, a small virus (4.6 MDa)
3×10-20 kg
in rats (16.1 ± 3.8 MDa)
6.8×10-20 kg
1.1×10-19 kg
in yeast (66 MDa)
2.5×10-19 kg
femtogram (fg)
1×10-18 kg
4.7×10-18 kg
sequence of length 4.6 Mbp, the length of the
~1×10-17 kg
virus, a large virus
1.1×10-17 kg
3×10-16 kg
cyanobacteria, the smallest (and possibly most plentiful) photosynthetic organism on Earth
picogram (pg)
1×10-15 kg
bacterium (wet weight)
6×10-15 kg
in a typical
human cell (approximate)
2.2×10-14 kg
6×10-14 kg
cell (quite variable)
1.5×10-13 kg
(dry weight)
 (ng)
1×10-12 kg
Average human
(1 nanogram)
2–3×10-12 kg
human cell
8×10-12 kg
2.5×10-10 kg
3.5×10-10 kg
(0.063 mm diameter, 350 nanograms)
 (ug)
3.6×10-9 kg
2.4×10-9 kg
for adults
1.5×10-8 kg
for adults
~2×10-8 kg
Uncertainty in the mass of the
(±~20 ug)[]
2.2×10-8 kg
~7×10-8 kg
One eyelash hair (approximate)
1.5×10-7 kg
for adults
2–3×10-7 kg
(dry weight)
10-6 to 1 kg[]
 (mg)
2.5×10-6 kg
, common smaller species (about 2.5 milligrams)
 (cg)
1.1×10-5 kg
Small granule of quartz (2 mm diameter, 11 milligrams)
2×10-5 kg
(Musca domestica, 21.4 milligrams)
 (dg)
0.27–2.0×10-4 kg
Range of amounts of
in one cup of
(27–200 milligrams)
2×10-4 kg
(200 milligrams)
1×10-3 kg
of water (1 gram)
1×10-3 kg
US dollar bill (1 gram)
~1×10-3 kg
(approximately 1 gram)
~8×10-3 kg
Coins of one
(7.5 grams), one
(8.1 grams) and one Canadian
(7 grams [pre-2012], 6.27 grams [2012-])
 (dag)
2–4×10-2 kg
Adult mouse (, 20–40 grams)
1.37×10-2 kg
defined as one
in the U.S. (13.7 grams)
2.8×10-2 kg
() (28.35 grams)
4.7×10-2 kg
of the energy that is called 1 megaton of
  (hg)
0.1-0.2 kg
(100–200 grams)
() (454 grams)
 (kg)
(0.001 m3) of water
Smallest breed of dog ()
computer, 2010
Adult domestic
Newborn human
Medium-sized
Large dog[]
130–180 kg
Mature , female (130 kg) and male (180 kg)
200-250 kg
240–450 kg
300–540 kg
Large Format (48-96 ch) Audio Recording and Mixing Console
400–900 kg
500–500,000 kg
material (0.5–500 tonnes)
635 kg
Heaviest human in history ()
(2000 pounds - U.S.)
 (Mg)
Metric ton/
1016.05 kg
(British) / 1
(2240 pounds - U.S.)
800–1600 kg
Typical passenger []
1.1×104 kg
(11 tonnes)
1.2×104 kg
on record (12 tonnes)[]
1.4×104 kg
(bell) (14 tonnes)
2.7×104 kg
computer, 1946 (30 tonnes)[]
Maximum gross mass (truck + load combined) of a
(40–44 tonnes)
5×104–6×104 kg
(50–60 tonnes)
6.0×104 kg
Largest single-piece ,
(60 tonnes)
7.3×104 kg
(73 tonnes)
1.8×105 kg
(180 tonnes)
4.2×105 kg
(417 tonnes)
World's heaviest aircraft:
(maximum take-off mass: 600 tonnes, payload: 250 tonnes)
 (Gg)
Trunk of the
tree named ,
by trunk volume (1121 tonnes)
2.0×106 kg
Launch mass of the
(2041 tonnes)
Largest , the
(largest living organism) (6000 tonnes)
7.8×106 kg
(submerged weight)
Annual production of
5.2×107 kg
when fully loaded (52,000 tonnes)
9.97×107 kg
ever: Australia's BHP Iron Ore, 2001 record (99,700 tonnes)
6.6×108 kg
Largest ship and largest mobile man-made object, , when fully loaded (660,000 tonnes)
Heaviest (non-pyramid) building,
in Bucharest, Romania
 (Tg)
4.3×109 kg
Amount of matter converted into energy by the
each second
6×1010 kg
in the , the world's largest concrete structure
~1×1011 kg
The mass of a
time equal to the
2×1011 kg
Amount of water stored in London storage reservoirs (0.2 km3)
4×1011 kg
Total mass of the world's human population
5×1011 kg
Total biomass of , probably the most plentiful animal species on the planet
 (Pg)
0.8–2.1×1012 kg
4×1012 kg
Global annual human food production
4×1012 kg
World crude
production in
5.5×1012 kg
material (5000 million tonnes)
4×1013 kg
Global annual human carbon dioxide emission
1.05×1014 kg
Global net
– the total mass of carbon fixed in organic compounds by photosynthesis each year on Earth
7.2×1014 kg
Total carbon stored in
 (Eg)
2.0×1015 kg
Total carbon stored in the terrestrial
3.5×1015 kg
Total carbon stored in
deposits worldwide
1×1016 kg
, the first asteroid ever to be closely approached by a spacecraft (rough estimate)
1×1016 kg
Rough estimate of the total
content of all organisms on Earth.
3.8×1016 kg
Total carbon stored in the oceans.
1.6×1017 kg
, a shepherd satellite for the inner edge of 's F Ring
 (Zg)
5.1×1018 kg
5.6×1018 kg
, a moon of Saturn
3×1019 kg
, one of the larger asteroids in the
3×1019 kg
9.4×1020 kg
within the asteroid belt
 (Yg)
1.4×1021 kg
1.5×1021 kg
, the largest moon of Pluto
2.9–3.7×1021 kg
1.3×1022 kg
2.1×1022 kg
, largest moon of Neptune
7.3×1022 kg
1.3×1023 kg
, largest moon of Saturn
1.5×1023 kg
, largest moon of Jupiter
3.3×1023 kg
6.4×1023 kg
4.9×1024 kg
6.0×1024 kg
3×1025 kg
8.7×1025 kg
1.0×1026 kg
5.7×1026 kg
1.9×1027 kg
2–14×1028 kg
(approximate)
3×1029 kg
, a nearby
2×1030 kg
or M☉ = 1.989×1030 kg)
2.8×1030 kg
(1.4 M☉)
4×1031 kg
star (20 M☉)
4–7×1032 kg
(230 to 345 M☉)
6–8×1032 kg
star cluster (300 to 400 M☉)
1.6×1033 kg
star cluster (800 M☉)
(overall range: 3×103 to 3×106 M☉)
2×1035 kg
Low end of mass range for giant
(1×105 to 1×107 M☉)
7.3×1035 kg
of a giant
at 100K and density 30
possible example:
1.79×1036 kg
The entire .
2.4×1036 kg
of stars, including the Sun (1.2×106 M☉)
7–8×1036 kg
The supermassive black hole at the center of the Milky Way, associated with the radio source
(3.7±0.2×106 M☉)
4.17×1040 kg
, the largest measured , weighing 21 billion
(2.1×1010 M☉)
4×1041 kg
Visible mass of the
1.2×1042 kg
(5.8×1011 M☉)
2–3×1042 kg
of galaxies, including the Milky Way (1.29±0.14×1012 M☉)
1–2×1045 kg
of galaxies, including the Local Group (1×1015 M☉)
4.4506×1052 kg
as estimated by
6×1052 kg
as estimated by the
1.45×1053 kg
This series on orders of magnitude does not have a range of larger masses
Criterion: A combined total of at least 250,000 Google hits on both the modern spelling (-gram) and the traditional British spelling (-gramme). 
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. The NIST Reference on Constants, Units, and Uncertainty. NIST.
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. American Mosquito Control Association. Smaller species found around houses commonly weigh about 2.5 milligrams.
Quartz has a density of 2.65. Mass = Volume × Density = (4/3 × π × (1e-3 m)?) × (2.65 × 1e3 kg/m?) = 1.1e-5 kg.
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. weight (g): 7.5
. United States Mint.
. Royal Canadian Mint.
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Calculated: 1e6 tons of TNT-equivalent × 4.184e9 J/ton of TNT-equivalent × 1.1e-17 kg of mass-equivalent/J = 4.7e-2 kg of mass-equivalent
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2011. 907 gms ... 2722 gms
2011. 2.0 lbs ... & 6 lbs
2011. 2500 g ... 4000 g
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2013. Roughly ranging from 20-50 pounds (9-23 kg)
2013. medium (30lbs to 60lbs)
2013. 25 to 50 pounds
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. Bluebook of Pianos 2011. 540 lbs ... 990 lbs
Calculated: 540 lbs × 0.4536 kg/lb = 240 kg. 990 lb × 0.4536 kg/lb = 450 kg.
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Jennifer Johnson. . Ohio State Department of Astronomy.
Using the quoted density of 1e5 to 1e8 kg/m? for white dwarf material, 1 teaspoon = 5mL = 5e-3 m? has a calculated mass of: Low end: 5e-3 m? × 1e5 kg/m? = 5e2 kg High end: 5e-3 m? × 1e8 kg/m? = 5e5 kg
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The average density of material in a neutron star of radius 10 km is 1.1×1012 kg cm-3. Therefore, 5 ml of such material is 5.5×1012 kg, or 5 500 000 000 . This is about 15 times the total mass of the human world population. Alternatively, 5 ml from a neutron star of radius 20 km radius (average density 8.35×1010 kg cm-3) has a mass of about 400 million metric tons, or about the mass of all humans.
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