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【单选题】
真空灭弧室的金属屏蔽筒的作用之一是( )。A.
扩散电弧产生的金属蒸气
B.
辅助导电作用
C.
改善真空灭弧室内部的电场分布
D.
增加载流量
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皮皮学刷刷变学霸
举一反三
【单选题】Up to the 1920's, what was one objection to the films?
A.
They were silent.
B.
They didn't tell a complete story.
C.
They were too expensive.
D.
They were too short.
【单选题】As a student, you shouldn’t have left home to earn money ________ your parents’ strong objection.
A.
because of
B.
due to
C.
as a result of
D.
regardless of
【单选题】I have no objection ______ for a hike on the mountains with Cynthia.
A.
to go
B.
going
C.
to going
D.
of going
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