A.提供附加阻尼力矩
B. 抑制电力系统低频振荡
C. 提高电力系统频率稳定性
D. 提高电力系统静态稳定限额
第2题
A.A change in interest rates
B.An increase in government spending
C.Lowering income taxes
D.Unemployment insurance
第9题
A.immerse food in very hot or boiling water
B.sterilize food
C.remove air from the cans
D.subject food to steam or boiling water
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