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【简答题】
三相半波可控整流电路中的三个晶闸管的触发脉冲相位按依次互差 度 ,当它带电阻负载时,α的移相范围为0- 度 ;当它带阻感负载时,α的移相范围为 0- 度 。
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【单选题】Which of the following is not the main reasons for the current population growth in UK.
A.
The d ecrease in d eaths and i ncrease in b irths .
B.
The i ncrease in n et i nternational m igration to the UK .
C.
The i ncrease in l ife e xpectancy .
D.
The special geographical location of Britain.
【单选题】The main reasons that can account for the 'culture of neglect' are the following EXCEPT ______
A.
social and economic factors result in less family time for adults
B.
women do not quit their jobs and take care of their children as they used to do
C.
there are so many disrupted families
D.
media idols intentionally disrespect authority and wisdom
【多选题】Many of the early civilizations began along major river systems. The main reasons listed in the passage inlude:
A.
The river systems provided these early civilizations with a consistent source of silt from the yearly floods for crops.
B.
The river systems provided these early civilizations with water for the crops.
C.
The silt from the yearly floods is like a natural fertilizer, bringing new minerals to enrich the crop depleted soil.
D.
The river systems provided these early civilizations with an easy transportation.
【简答题】What were the main reasons for the reemergence of cognitive psychology in the 1950s?
【单选题】Why didn’t Vanity help Love?
A.
Because her boat was full and there was no place for Love.
B.
Because she thought Love was all wet and might damage her boat.
C.
Because she felt so sad that she needed to be by herself.
D.
Because she did not even hear when Love called her.
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