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【单选题】
相同温度下,实际物体的半球总辐射力与黑体半球总辐射力之比是A.
发射率 (也称为黑度)
B.
吸收率
C.
发射特性
D.
吸收特性
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反馈参考答案：
举一反三
【单选题】Although Math is very difficult, you can't _____. [ ]
A.
give in it
B.
give it in
C.
give up it
D.
give it up
【单选题】Math is a little difficult, but I still like it very much.
A.
few
B.
kind
C.
kind of
D.
a few
【简答题】组织构成因素有哪些?
【单选题】—Math is too difficult, I nearly give it up. —Please don't, nothing is ______ if you put your heart into it. [ ]
A.
important
B.
impossible
C.
interesting
【单选题】—Math is too difficult. I want to give it up. —Please don’t. Nothing is _________if you put your heart into it.
A.
important
B.
impossible
C.
interesting
D.
Necessary
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