整机试验摩擦连接器摩擦电流应调整到额定电流2A的1.3倍,()不大于0.3A(仅允许上偏差)。
参考答案:定,反位
I ______ Beijing for Shanghai in a few days. Do you know when the earliest plane ________?[ ]
A. leaves; takes off
B. am leaving; takes off
C. leave; is taking off
D. am leaving; is taking off
若某无水塔管网的控制点为4层建筑,控制点地面标高为160.00m;清水池最低水位标高为140.00m,在最高用水时管网水头损失为10m,设泵房内管路(包括吸水管)水头损失为3m,则此时二级泵站扬程为( )。
A.33m B.43m C.23m D.53m