A.always higher.
B.always the same.
C.always lower.
D.sometimes higher and sometimes lower.
第1题
A.0.0
B.0.1
C.0.2
D.0.3
第2题
A.White S
B.Orange S
C.Red S
D.Brown S
第3题
A.0.2;0.5
B.0.5;0.2
C.0.5;0.9
D.0.9;0.5
第4题
A.2% of the 0.60 μm wavelength light that strikes its surface.
B.98% of the 0.60 μm wavelength light that strikes its surface.
C.2% of all the visible light that strikes its surface.
D.98% of all the visible light that strikes its surface.
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