单项选择题

下面哪个 jQuery 选择器选择具有给定元素 id 为 box 的元素？（ )

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多项选择题

Which of the following statements is correct?
A、Ultra high purity films can be obtained by thermal evaporation.
B、E-beam evaporation cannot be used to deposit films on wafers with MOS devices already made on their surfaces.
C、The thicknesses of deposited films can be well controlled during evaporation deposition.
D、It is not possible to deposit refractory materials by vacuum evaporation.

单项选择题

在标准状态下体积比为1∶2的氧气和氦气(均视为刚性分子理想气体)相混合,混合气体中氧气和氦气的内能之比为 A.
1∶2. B.
5∶6. C.
5∶3. D.
10∶3.