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【单选题】
下列制动，能平滑制动的是A.
断电抱闸制动
B.
通电抱闸制动
C.
反接制动
D.
能耗制动
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】用万用表电阻挡测得JFW2621型发电机磁场和搭铁两接柱之间的阻值为( )时,说明正常。
【单选题】The car was running so fast that it crashed into the truck and the driver was killed ______the spot.
A.
on
B.
at
C.
by
D.
to
【单选题】The car crashed into the back of a truck and the driver was trapped for about an hour being taken to hospital.
A.
when
B.
before
C.
after
D.
until
【单选题】The car crashed into the train, and the driver was killed ______ the spot.
A.
on
B.
at
C.
to
D.
by
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