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【单选题】
在真空中波长为 的单色光,在折射率为n的透明介质中从A沿某路径传播到B,若A,B两点位相差为3 ,则此路径AB的光程为:A.
1.5
B.
1.5n
C.
3
D.
1.5 /n
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举一反三
【单选题】Owing to the unrest in North Africa, the Chinese government is _____ efforts to withdraw its nationals from Libya and neighboring countries.
A.
opening up
B.
stepping up
C.
making up
D.
taking up
【简答题】均聚物结构单元键接顺序 、 、 。
【单选题】Nongfu Spring, one of China’s biggest bottled water companies, was reported ________ to meet national standards, and its chairman held a news conference in Beijing on May 7.
A.
having failed
B.
to fail
C.
failing
D.
to have failed
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