单项选择题

By the mid-1920s, American film industry came into the hands of a few powerful companies, which controlled production, distribution and exhibition. Normally, they were called “the Big Five” and “the Little Three” as well.________

A．对
B．错

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多项选择题

疏水器的作用是( )。 A.
根据需要降低蒸汽压力,并保持压力在一定范围不变 B.
自动排放蒸汽管道中的凝结水 C.
阻止蒸汽漏失 D.
排除空气等非凝性气体 E.
防止汽水混合物对系统的水击

单项选择题

要全天候全方位感知网络安全态势，知己知彼才能百战不殆。没有意识到风险是最大的风险。

A.正确 B.错误