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【判断题】
对别人说失礼了,应该说:“실례가 정말 많았습니다” ( )
A.
正确
B.
错误
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举一反三
【单选题】— Do you know ______ he has done with the money? — He has bought a new house in a garden district. [     ]
A.
how
B.
when
C.
what
D.
where
查看完整题目与答案
【单选题】用不可控 整流器 整流, 相比用可控整流器整流 。
A.
谐波可以减少
B.
谐波 会增加
C.
功率因数高
D.
功率因数 低
查看完整题目与答案
【判断题】带平衡电抗器的双反星形可控整流电路，其输出电压脉动较小且变压器无直流磁化问题，与不带平衡电抗器的双反星形可控整流电路相比，变压器的利用率可提高一倍，对晶闸管电流定额的要求也较低。
A.
正确
B.
错误
查看完整题目与答案
【判断题】带平衡电抗器的双反星可控整流电路，其输出电压脉动较小且变压器无直流磁化问题，与不带平衡电抗器的双反星形可控整流电路相比，变压器的利用率可提高一倍，对晶闸管电流定额的要求也较低。
A.
正确
B.
错误
查看完整题目与答案
【单选题】He talks as if he ______ everything.
A.
knows
B.
has known
C.
knew
D.
will know
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【单选题】－－Has he finished his essay? －－I dont know. He __________ it this morning.A.has written##
A.
--Has he finished his essay? --I dont know. He __________ it this morning. A.has written
B.
was writing
C.
wrote
D.
had written
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【判断题】双反星可控整流电路的特点之一,是整流变压器副边铁芯线圈的利用率要比六相半波可控整流电路提高 1 倍,因此,在要求输出同样大小功率的条件下,变压器的容量小了不少,而且不存在直流磁化问题。
A.
正确
B.
错误
查看完整题目与答案
【单选题】与单相半波整流电路相比,单相全波整流电路优点说法不正确的是( )。
A.
可控性强，反应快
B.
直流输出脉动小
C.
晶闸管承受电压低
D.
整流变压器利用率低
查看完整题目与答案
【单选题】---Do you know how long ________?  ----I’m sorry I don’t know.
A.
he has come here
B.
has he been married
C.
Tom has bought the car
D.
his uncle has been abroad
查看完整题目与答案
【单选题】I don’t know whether he has finished the novel, but he ________ it this morning.
A.
was reading
B.
has read
C.
read
D.
had read
查看完整题目与答案
相关题目：
【单选题】— Do you know ______ he has done with the money? — He has bought a new house in a garden district. [     ]
A.
how
B.
when
C.
what
D.
where
查看完整题目与答案
【单选题】用不可控 整流器 整流, 相比用可控整流器整流 。
A.
谐波可以减少
B.
谐波 会增加
C.
功率因数高
D.
功率因数 低
查看完整题目与答案
【判断题】带平衡电抗器的双反星形可控整流电路，其输出电压脉动较小且变压器无直流磁化问题，与不带平衡电抗器的双反星形可控整流电路相比，变压器的利用率可提高一倍，对晶闸管电流定额的要求也较低。
A.
正确
B.
错误
查看完整题目与答案
【判断题】带平衡电抗器的双反星可控整流电路，其输出电压脉动较小且变压器无直流磁化问题，与不带平衡电抗器的双反星形可控整流电路相比，变压器的利用率可提高一倍，对晶闸管电流定额的要求也较低。
A.
正确
B.
错误
查看完整题目与答案
【单选题】He talks as if he ______ everything.
A.
knows
B.
has known
C.
knew
D.
will know
查看完整题目与答案
【单选题】－－Has he finished his essay? －－I dont know. He __________ it this morning.A.has written##
A.
--Has he finished his essay? --I dont know. He __________ it this morning. A.has written
B.
was writing
C.
wrote
D.
had written
查看完整题目与答案
【判断题】双反星可控整流电路的特点之一,是整流变压器副边铁芯线圈的利用率要比六相半波可控整流电路提高 1 倍,因此,在要求输出同样大小功率的条件下,变压器的容量小了不少,而且不存在直流磁化问题。
A.
正确
B.
错误
查看完整题目与答案
【单选题】与单相半波整流电路相比,单相全波整流电路优点说法不正确的是( )。
A.
可控性强，反应快
B.
直流输出脉动小
C.
晶闸管承受电压低
D.
整流变压器利用率低
查看完整题目与答案
【单选题】---Do you know how long ________?  ----I’m sorry I don’t know.
A.
he has come here
B.
has he been married
C.
Tom has bought the car
D.
his uncle has been abroad
查看完整题目与答案
【单选题】I don’t know whether he has finished the novel, but he ________ it this morning.
A.
was reading
B.
has read
C.
read
D.
had read
查看完整题目与答案