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【简答题】
25-6判断以下各种说法是否正确: (1)额定运行时定子绕组为Y联结的三相异步电动机,不能采用Y-△起动. (2)三相鼠笼型异步电动机直接起动时,电流很大,为了避免起动过程中因过大电流而烧毁电动机,轻载时需要采取降压起动. (3)电动机拖动的负载越大,电流就越大,因此只要是空载,三相异步电动机就都可以直接起动. (4)三相绕线型异步电动机,若在定子侧串人电阻或电抗都可以减小转矩和电流;若在转子侧串入电阻或电抗,都可以增大转矩和减小电流.
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举一反三
【单选题】The new Greenpeace card breaks down in a few months.
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】In “Detective on the Trail”, Bob Sugg’s favorite part of the newspaper was ______.
【单选题】琴、筝、瑟早在周、秦时代就有了,汉代的箜篌、阮,隋、唐的琵琶,元代的三弦,明代的扬琴等等,一直在我国音乐历史上占有重要地位。按弹奏原理,大致可分为 3 类:平置弹奏的是( ) 。
A.
如琴、筝、瑟等；
B.
如琵琶、三弦、月琴、柳琴、阮等；
C.
如扬琴等；
D.
如二胡等；
【单选题】The Shipbreakers of Alang arouse the ire of Greenpeace because of
A.
India's non - repentant nuclear stance.
B.
India's import - competing industrialization policies.
C.
the difficulty of avoiding ship accidents between Greenpeace's sailboat and the reconstructed Container ships of Alang.
D.
the large amount of pollution associated with the operations at Alang.
【单选题】The Shipbreakers of Alang arouse the ire of Greenpeace because of
A.
India's non-repentant nuclear stance.
B.
India's import-competing industrialization policies.
C.
the difficulty of avoiding ship accidents between Greenpeace's sailboat and the reconstructed Container ships of Alang.
D.
the large amount of pollution associated with the operations at Alang.
E.
their competition with capital-intensive industries.
【单选题】—Have you ________ him to give up the job? —Yes，I have. But he doesn’t listen to me.
A.
persuaded
B.
suggested
C.
agreed
D.
advised
【单选题】Greenpeace have suggested that it___________be possible to reduce deforestation(森林砍伐)if traditional forms of agriculture are promoted.
A.
is going to
B.
might
C.
must
【简答题】In g__________, he can get along well with his classmates.
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