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【简答题】
面心立方晶胞中的原子个数为()
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举一反三
【简答题】The wavelength range of UV-A is . (320 nm-400 nm / 420 nm-500 nm)
【简答题】The wavelength range of UV-A is .
【单选题】下列各组量子数(n,l,m, )合理的是( )
A.
3，1，＋2，＋1/2
B.
1，2，0，＋1/2
C.
2，1，0，-1/2
D.
2，-1，-1，＋1/2
E.
3，-2，2，-1/2
【单选题】At present, the wavelength range of optical wave used in optical communication is ( ).
A.
0.4μm-2.0μm
B.
0.4μm-1.8μm
C.
0.4μm-1.5μm
D.
0.8μm-1.8μm
【简答题】The wavelength range of UV-B is .(280 nm-320 nm / 320 nm-360 nm)
【单选题】The wavelength range of UV-A is ( ).
A.
400 nm-600 nm
B.
400nm-700nm
C.
200nm-400nm
D.
320 nm-400 nm
【简答题】汽车防爆膜的(什么主要是反射和阻挡红外线及能产生大热量的波长范围的光线,实现隔热、隔紫外线功？Automobile explosion-proof film (what is the main reflection and blockade of infrared rays and can produce large heat in the wavelength range of light, t...
【单选题】Transmittance spectra of the heat reflector were measured __________ the wavelength range of 300 nm to 2000 nm at normal incidence.
A.
in
B.
on
C.
for
D.
by
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