偶合器由两个工作叶轮、()、涡轮组成。
参考答案:泵轮
After the party, most guests left, with only two of them__________in the host family, him cleaning up.
A.remaining; helped
B.remaining; helping
C.remained; helped
D.remained; helping
蓄电池连接条压降要求:1h率放电电流情况下小于。()
A、10mv
B、100mv
C、1v