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【单选题】
接触器是一种自动控制电器,其作用是A.
不频繁的接通或断开电路
B.
频繁的接通或断开电路,但不具备任何保护功能
C.
频繁的接通或断开电路,且具备一定的保护功能
D.
和普通开关的作用基本相同,只是能够控制的距离较远
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举一反三
【简答题】根据首字母或中文提示填写符合句意的单词 1. You can get championship only if you beat the other _____________( 竞争者 ). 2. Rome (罗马) is famous for it's a___________ buildings. 3. People usually hold o___________ branches t...
【简答题】Task 1 Fill in the blanks with the correct form of the given verbs. 1. I _________________________(bring) up by my grandma. 2.French ______________________(speak) as the official language in Canada. 3...
【简答题】Vocabulary Activities 3 (P189) 填写词组 1. Mary's mother didn't know how she was going to manage to ______________________ the money for her tuition and fees . (sc) 2. The ice-cream lady walked slowly...
【简答题】齿轮加工时的定位基准应尽可能与装配基准,测量基准一致,符合____原则。
【单选题】Hold the money in your bank account ______ you use it for college courses.
A.
although
B.
as if
C.
unless
D.
whether
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