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【简答题】
如图所示某降压变电所一台容量为 20MVA、电压为110/11kV的变压器,要求变压器低压侧的偏移在大小负荷时分别不超过额定值的2.5%和7.5%,最大负荷为18MVA,最小负荷为7MVA, =0.8,变压器高压侧的电压在任何运行情况下均维持107.5kV,变压器参数为 U k %=10.5, P k =163kW,励磁影响不计。试选择变压器的分接头。
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举一反三
【单选题】Her voice sounds very beautiful and she is a ______ singer . [ ]
A.
promise
B.
promised
C.
promising
D.
futureless
【简答题】A. take B. create C. promise D. wonder
【单选题】Unless he ________ to help us, we shall lose the game. A. promises B. will promise C. would promise D. had promised
A.
a
B.
b
C.
c
D.
d
【单选题】如图所示电路,下列说法正确的是
A.
电压源和电流源均为电源，发出功率。
B.
电压源和电流源均为负载，吸收功率。
C.
电流源为电源，发出功率；电压源为负载，吸收功率。
D.
电流源为负载，吸收功率；电压源为电源，发出功率。
【单选题】Having the right equipment __________ will be enormously helpful.
A.
hand back
B.
hand in
C.
hand on
D.
at hand
【单选题】Jim could not promise anything. Why?
A.
He thought George was guilty.
B.
George's case was too serious.
C.
The other members might not listen to his recommendation.
D.
He did not want to help George.
【单选题】If she doesn't want to go, nothing you can say will her. [ ]
A.
persuade
B.
promise
C.
invite
D.
support
【简答题】A． offer B． sacrifice C． promise D． difference
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