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【多选题】
关于同步发电机的励磁磁动势,下面说法正确的是A.
隐极同步发电机的励磁磁动势是空间正弦波
B.
隐极同步发电机的励磁磁动势是空间阶梯波
C.
凸极同步发电机的励磁磁动势是空间正弦波
D.
凸极同步发电机的励磁磁动势是空间阶梯波
E.
凸极同步发电机的励磁磁动势是空间矩形波
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反馈参考答案：
举一反三
【单选题】The government will pipe natural gas to the city's homes in order to ______.
A.
solve the problem of being short of fuel
B.
bring down the cost of daily life
C.
reduce the pollution of the capital
D.
keep up with the development of modem society
【简答题】被装扮
【单选题】可吸入颗粒物的粒径为
A.
＜ 10 μ m
B.
＞ 5 μ m
C.
5 μ m ～ 15 μ m
D.
1 μ m ～ 5 μ m
E.
0.1 μ m ～ 4 μ m
【单选题】Dr. Smith failed many times but he finally ______ to find a successful way to solve the problem.
A.
broke off
B.
broke down
C.
broke out
D.
broke through
【简答题】The special committee recommended that _________ (这项工程不应动工)until all the preparations have been made.
【简答题】Washington and Lee worked together with parents as______to help minorities at a special pre-enrollment session.
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