皮皮学，免费搜题
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【单选题】
反接制动是依靠改变电动机定子绕组的电源( )来产生制动力矩,迫使电动机迅速停转的。A.
B.
频率
C.
电压
D.
电流
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
【单选题】Recently a number of cases have been reported of young children ______ a violent act preciously seen on television.
A.
modifying
B.
duplicating
C.
accelerating
D.
stimulating
【单选题】Recently a number of cases have been reported of young children iterate a violent act previously seen on television.
A.
modifying
B.
duplicating
C.
accelerating
D.
stimulating
【单选题】Recently a number of cases have been reported of young children ______ a violent act previously seen on television.
A.
modifying
B.
duplicating
C.
accelerating
D.
stimulating
【简答题】化学专业词汇汉译英: 极性共价键
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