The policy is designed to prevent the __________ of one group over another.
A. timidity
B. predominance
C. commitment
D. pessimism
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Our ________ comes from the constant study of the whole group.
A. control
B. vigor
C. ideal
D. immortality
When your spirit is covered with snows of _________ and the ice of pessimism, then you are grown old, even at 20.
A. optimism
B. happiness
C. cynicism
D. pleasure
变压器联结组别Yd11中，d表示的含义是什么（）？
A. 高压绕组用星型联结
B. 高压绕组用三角形联结
C. 低压绕组用星型联结
D. 低压绕组用三角形联结
变压器绕组的联结方式Dyn11中的11的含义为（）？
A. 变压器低压绕组的线电动势滞后高压绕组的线电动势30度
B. 变压器低压绕组的线电动势滞后高压绕组的线电动势330度
C. 变压器低压绕组的线电动势滞后高压绕组的线电动势300度
D. 变压器低压绕组的线电动势滞后高压绕组的线电动势60度
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