判断题

隔离开关与断路器配合的操作原则是:“先断开断路器后拉开隔离开关”或“先接通隔离开关后合上断路器”。
正确
错误

答案：正确

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多项选择题

Which of the following statements can be regarded as fundamental views about language ?

A．Language is instrumental.
B．Language is social and conventional.
C．Language consists of the systems of sounds and grammar.
D．Some people speak a dialect; others don't.

单项选择题

对于返回式人造地球卫星,当再入大气层时,处于再入加热环境,因防热必须具有什么结构( ) A.
防热结构 B.
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耐磨结构 D.
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