油氢差压过高或过低有哪些影响？
参考答案：
当油氢压差过大时，将使一部分密封油流入发电机内。
当油氢压差过小时，将造成漏氢现象。
I do believe that ______ swim across the river, but, in that situation, I ____ do that.
A．am able; couldn’t
B．could; was able to
C．was quite able to; couldn’t
D．couldn’t was able to
城市开发中常提到的“七通一平”，下列不属于“七通”的是()。
A.空气管道
B.排水沟管
C.电信线路
D.道路贯通
