判断活塞式压缩机二级排气出口冷却器泄漏的可能原因正确的是()
A.一级排气温度下降
B.二级排气温度下降
C.二级吸气温度下降
D.三级吸气温度下降
参考答案:D
— How long do you think it'll be _____ I can go back to work?
— Well, you'll be feeling much better by next weekend. [ ]
A. before
B. when
C. until
D. that
下列关于航海环境特点描述不正确的是()。
A.噪声
B.振动
C.电离辐射
D.高温
E.粉尘