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第1题

2分)______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home. A. To wait B.
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第2题

在电气控制原理电路图中常用到几种“锁”字电路，如自锁、 以及顺序联锁等。
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第3题

(2分)Does this car （ ）to be repaired? A. need B. must C. have D. can
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第4题

(2分)College students often complain that they only have little personal ______ with the teaching staff after class.
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