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【单选题】
步进电动机双三拍与拍工作方式比较，前者（）。A.
电磁转矩小、易产生失步
B.
电磁转矩小、不易产生失步
C.
电磁转矩大、易产生失步
D.
电磁转矩大、不易产生失步
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反馈参考答案：
举一反三
【单选题】He often reads books in the , because there are so many books there. [ ]
A.
pool
B.
library
C.
mall
D.
restaurant
【单选题】There are a great many books in the store, some are useful to us. [ ]
A.
of them
B.
in which
C.
of which
D.
in them
【简答题】From the passage we can infer this textbook is written mainly for ______ to read.
【简答题】Some people enjoy reading and they like to go to the book show. There are many books in the show. If you can’t find some books in libraries or bookshops, come to the book show. You must find them here...
【简答题】There are many books in the s________.
【简答题】There ____ many books in our bedroom.
【单选题】He picked a textbook from the bookshelf and then commenced to read.
A.
directed
B.
commented
C.
committed
D.
began
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