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【简答题】
简述罩极式单相异步电动机的工作原理。罩极式单相异步电动机的转向如何确定？若不拆卸重新装配转子，是否可以使其反转？这种电动机的主要优缺点是什么？
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举一反三
【单选题】– Where is your father now? – He _____Hongkong. He____there for three days.
A.
has gone to , has been to
B.
has been to , has been
C.
has gone to , has been
D.
went , was
【单选题】美国教育学家爱德加·戴尔提出了“经验之塔”理论,他用一个学习经验的三角形塔来表示不同经验的抽象程度,他认为最抽象的是( )。
A.
视觉符号
B.
电影电视
C.
语言符号
D.
角色扮演
【单选题】He has stopped taking heroin (海洛因) now, but admits ________ that he will always be a drug addict.
A.
practically
B.
violently
C.
sincerely
D.
candidly
【单选题】He has to do his homework now, _______? [ ]
A.
has he
B.
hasn't him
C.
does he
D.
doesn't he
【简答题】经验之塔理论是谁提出来的( ) a. 加涅 b. 巴班斯基 c. 戴尔 d. 布鲁纳
【单选题】—John has spoken Japanese well now. —______, and _____.
A.
So he has , so you have
B.
So he has , so have you
C.
So has he, so have you
D.
So has he, so you have.
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