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【单选题】
CA6140型车床主回路加电试车时，经过一段时间试运行，观察、检查电动机有无异常响声、异味、冒烟、振动和（）等异常现象。A.
过低
B.
过高
C.
不高于
D.
不低于
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【单选题】It’s very funny that many people who lose weight gain it back after some time and end up back __________ they started.
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