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【简答题】
干洁空气中氮气与氧气的体积分数可近似为78%和21%，已知氮气、氧气和干空气的分子量分别是28、32和28.966，那么干空气中氮气与氧气的质量百分数分别是______和______。
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反馈参考答案：
举一反三
【简答题】测量电阻时,应选择适当的倍率档,使指针尽可能接近标度尺的( ),这样可提高测量数据的准确性。
【单选题】Designer clothes are not a passport to instant .
A.
glamour
B.
grace
C.
charm
D.
fascination
【单选题】I feel nothing but contempt for people who are _________ with fast cars and designer clothes.
A.
annoyed
B.
inspired
C.
obsessed
D.
exhausted
【简答题】Uniforms are also _____ ________ _____ popular designer clothes.
【单选题】We are going to _______ hundreds of dollars on designer clothes.
A.
splash on
B.
splash out
C.
splash down
【简答题】与现在事实相反: If I _______(know) his telephone number, I _________(tell) you.
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