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【简答题】
绕线式异步电动机在起动过程中，频敏变阻器的等效阻抗变化趋势是_______________。 A. 由大变小
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皮皮学刷刷变学霸
举一反三
【单选题】He will _ English for six years by the time he takes the exam.
A.
have been studying
B.
have studied
C.
had studied
D.
studying
【单选题】—________ does John go to school? —He takes the underground.
A.
How
B.
What
C.
When
D.
Where
【单选题】By the time he takes the final exam, he ___ more than five lectures in this semester.
A.
will attend
B.
has attended
C.
had attended
D.
will have attended
【单选题】He _________ the great difficulty that he will face if he takes the task.
A.
is aware of
B.
is aware that
C.
came to know
D.
recognizes
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