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【单选题】
QC83-80型磁力起动器吸合磁铁鸣声大的原因是：（）。
A.
弹簧反作用力太小
B.
短路环脱落
C.
衔铁太轻
D.
衔铁与铁心间隙过小
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Questions 57 to 61 are based on the following passage. Within fifteen years Britain and other nations should be well on with the building of huge industrial architectures for the recycling of waste. T...
A.
attempts to find efficient ways of recycling wastes
B.
efforts to protect the environment in British cities
C.
a good way to locate plants for waste recycling
D.
a cheap way to get energy from waste materials