相关考题
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单项选择题
电容器用熔断器保护时，单台电容器可按电容器额定电流的（）倍选用熔体的额定电流。
A、1.5～2.5
B、1.3～1.8
C、2.5 -
单项选择题
（）是真空断路器的绝缘和灭弧元件。
A、辅助开关
B、真空灭弧室
C、波纹管
D、操动机构 -
单项选择题
Their government said that they had to use force to maintain social stability，but many people（）that it wouldn’t（）stability and harmony.
A.contradicted them by saying；make
B.countered by saying；make for
C.opposed by saying；make up
D.have been lagged behind；slip off
