【单选题】【消耗次数：1】
一台三相变压器的联接组别为YN，d11，其中的“11”表示变压器的低压边( )电角度。
①
线电势相位超前高压边线电势相位330°
②
线电势相位滞后高压边线电势相位330°
③
相电势相位超前高压边相电势相位30°
④
相电势相位滞后高压边相电势相位30°
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【判断题】
三相变压器的时钟表示法就是把高压绕组线电势作为时钟的长针，永远指向“12”点钟，低压绕组的线电势作为短针，根据高、低压绕组线电势之间的相位指向不同的钟点？
①
正确
②
错误
【单选题】
设一台隐极同步发电机的电枢电流I落后于空载电势E030°时间相位角，则电? 枢反应磁场与转子励磁磁场轴线间的空间相位角为_____。
①
30°；?
②
60°；?
③
120°；
随机题目
【单选题】
12. I’m very sorry to have _______ you with so many questions on such an occasion.
①
interfered
②
offended
③
impressed
④
bothered
【单选题】
7. It is so quiet that you can hear a pin ______.
①
dropping
②
. dropped
③
drop
④
drops
【单选题】
4. The instructor watched the student ____ the test.
①
to take
②
take
③
takes
④
took
【单选题】
20. _____ the sight of the poor and the sick, the government had no way out but to decided to reform..
①
Seeing
②
Confronted with
③
Confronting
④
Looking at
【单选题】
1. Decide which of the following best states the authors purpose of writing?
①
To express his anguish of movig from his old home
②
To describe the laughter and tears of the four generations of his family
③
to explain the real meaning of his grandpas wordsneversay googbye‘
④
To tell the story of his grandpas death
【单选题】
21. Take good care to _____ your jewelry before going on away on holiday..
①
safe
②
lock in
③
lock away
④
lock with
【单选题】
16. He was put into prison, but he never _____ ,and continued his fight.
①
gave up
②
gave in
③
stopped
④
gave way
【判断题】
If too many details are retained in a precis, it can hardly be considered a good precis.
①
正确
②
错误