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【多选题】
关于三相异步电动机的回馈制动,下列说法正确的是A.
回馈制动发生在电动机转速高于磁场转速时
B.
回馈制动可以应用在起重机下放重物
C.
回馈制动时，电动机工作在发电机状态下
D.
回馈制动时，电动机虽然在制动状态下，但转速还有短时增加，达到平衡点时才停止增速
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【单选题】When Alice was small enough to get through the door, she ran out of the house and soon found herself in a thick wood, without being caught by the crowd of little animals waiting outside. The two thing...
A.
grow to her right size and get out of the magic world
B.
grow to her right size and find her way into that lovely garden
C.
find her way into that lovely garden and get out of the magic world
D.
grow to her right size and take part in the mad Tea Party
【单选题】She took her son, ran out of the house, _______ him in the car and drove quickly to the nearest doctor’s office.
A.
putting
B.
put
C.
to put
D.
having put
【单选题】______ the voice of her father, she was happy and ran out of the room to greet him.
A.
Heard
B.
Hearing
C.
Sounding
D.
Sounded
【单选题】物料管理的5R原则中的适时原则是指( )
A.
用合理的成本取得所需的物料
B.
供应商进来的数量能控制适当，这也是防止呆料很 重要的工作
C.
进来的物料或发出去使用的物料，品质是符合标准的
D.
在要用的时候，很及时地供应物料，不会断料
【单选题】She took her son, ran out of the house, ________ him in the car and drove quickly to the nearest doctor’s office.
A.
put
B.
to put
C.
putting
D.
having put
【单选题】物料管理的5R原则中的适量原则是指( )
A.
供料源与使用的地方愈近，就愈方便，机动性高，联系与处理费用愈低
B.
供应商进来的数量能控制适当，这也是防止呆料很重要的工作
C.
用合理的成本取得所需的物料
D.
在要用的时候，很及时地供应物料，不会断料
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