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【单选题】
We decided to conduct an experiment.A.
conduct
B.
conductor
C.
conduction
D.
conducting
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【单选题】The entertainment industry and technology companies have been warring for years over the dazzling ability of computers and the Internet to copy and transmit music and movies. A crucial battle ended th...
A.
indeed hit the piracy industry hard.
B.
has little impact on content sharing.
C.
may prevent tech firms from innovating.
D.
can lead to a flourish of entertainment industry.
【判断题】折射率为n2, 厚度为e的平行薄膜,位于介质中,薄膜上表面的介质折射率为n1, 薄膜下表面的介质折射率为n3, 且有n1>n2n3,一束平行单色光垂直照射到薄膜上,则反射光的光程差为薄膜的厚度与薄膜折射率乘积的两倍。
A.
正确
B.
错误
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