2020.跌落式熔断器熔管轴线与铅垂线的夹角应为( )。(重点)

2020.跌落式熔断器熔管轴线与铅垂线的夹角应为( )。(重点)

A.15°~30°

B.10°~30°

C.15°~25°

D.25°~35°

正确答案是A