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【单选题】
（ ）位于变压器油箱上方，通过气体继电器与油箱相通。A.
冷却装置
B.
储油柜
C.
防爆管
D.
吸湿器
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反馈参考答案：
举一反三
【单选题】On a medium-speed main propulsion diesel engine, the crank-pin or crank journal
A.
arings receive lubricating oil from ____.
B.
a spindle(锭子或主轴)lubricator
C.
an oiljet(喷射器)
D.
internal splashing
E.
drilled passages in the crankshaft
【单选题】- It’s been a wonderful day.- Yes, fantastic. We’ve had no______with anything. Everything’s been perfect.
A.
obstacles
B.
questions
C.
harriers
D.
problems
【单选题】听力原文：What's the weather going to be like tomorrow? (A) We've had a lot of rain. (B) It's supposed to be nice. (C) My son will be there. (26)
A.
B.
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