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【判断题】
三相异步电动机根据转子结构不同可分为笼型异步电动机和绕线型异步电动机两类。A.
正确
B.
错误
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举一反三
【简答题】________ the earth to be flat, many feared that Columbus would fall off the edge of the earth. A) Having believed B) Believing C) Believed D) Being believed
【单选题】What causes the Earth to be warmer according to the video clip ?
A.
The atmosphere .
B.
The greenhouse gases .
C.
The sunbeams.
D.
The radiation from the outer space.
【单选题】_____ the earth to be flat, many feared that Columbus would fall off the edge of the earth. [ ]
A.
Having believed
B.
Believing
C.
Believed
D.
Being believed
【单选题】______ the earth to be flat, people feared that Columbus would fall off the edge of the earth.
A.
Having believed
B.
To believe
C.
Believing
D.
Believed
【单选题】Many early Europeans, ________ the earth to be flat, feared that Columbus would fall off the edge of the earth.
A.
believing
B.
having believed
C.
believed
D.
to believe
【单选题】_________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
A.
Having believed
B.
Believed
C.
Believing
D.
Being believed
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