自1918年至1919年孙中山深居简出,发愤著述,撰写了《孙文学说》和()。
参考答案:《实业计划》
—Which would you like, a cup of tea or a glass of milk?
—_______. I think I'll just have a glass of water. [ ]
A. Both
B. Neither
C. None
泵排出压力pd=0.55MPa,吸入压力ps=-0.05MPa,流量Q=60m3/h,总效率η=80%,其轴功率为()。
A.10kW
B.12.5kW
C.10.4kW
D.8kW