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【简答题】
已知空气的击穿场强为 3 × 10 6 V/m ,则处于空气中的一个半径为 1 m 的球形导体能达到的最高电势 U max =______________V .
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【简答题】—There is a bad smell here. —Oh, dear! I_______ the gas. [ A] must forget turning off [ B ] must forget to turn off [ C] must have forgotten turning off [ D] must have forgotten to turn off
【简答题】汽油机明显燃烧期越短,越靠近上止点,汽油机的 和 越好。
【单选题】-- There is a bad smell here. -- Oh, dear! I ______ the gas.
A.
must forget turning off
B.
must forget to turn off
C.
must have forgotten turning off
D.
must have forgotten to turn off
【单选题】—Oh, dear, I forget the air tickets./--You _______ something.
A.
have left
B.
are always leaving
C.
are leaving
D.
always left
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