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【多选题】
斗轮机液压系统电机不能转动或嗡嗡叫的原因有（）。
A.
电路故障；
B.
电机损坏；
C.
缺相；
D.
没供220V电源。
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】By the time I finished high school, my interest in animals had grown, and enrolled at a university to study biology. I learned soon enough that studying animals (56) this level was not in the animal...
A.
step
B.
review
C.
glance
D.
gesture