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【多选题】
三相异步电动机常用的调速方法有()。A.
改变电源频率
B.
改变磁极对数
C.
改变电源电压
D.
改变转差率
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【简答题】用act的正确形式填空 Jack Chen is a famous______. Our monitor took an _________ part in the party. We take part in outdoor activities _____. He is famous for his ______ films. It is important for us to take pa...
【单选题】The monitor took the ________ and arranged the class reunion.
A.
initiative
B.
creation
C.
invention
D.
activity
【简答题】Computers monitor everything in Singapore from soil composition to location of manholes . At the airport , it took just 15 seconds for the computerized immigration system to scan and approve my passpo...
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