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【判断题】
为了保证三相异步电动机实现正反转,正、反转接触器的主触头必须按相同的接后串接在主电路中。( )A.
正确
B.
错误
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【单选题】What can you focus on in a piece of writing?
A.
the thesis statement
B.
a topic sentence
C.
the title
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