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桥式起重机“制动器打不开,制动力矩过大,表现为电动机‘没劲’”的现象,引起的可能原因有()。

A、电磁铁线圈烧毁
B、液力推动器油液使用不当
C、辅助弹簧失效,推不开制动臂,瓦衬始终贴压在动轮上
D、制动轮工作表面粗糙
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正确答案:

AB

答案解析:

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C.Foodandcancer

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