在泵中,需要考虑径向力存在问题的是()。
A.蜗壳式离心泵
B.齿轮泵
C.导轮式离心泵
D.径向柱塞泵
E.单作用叶片泵
F.双作用叶片泵
参考答案:A, B, D, E
Yao Ming, now a student of Shanghai Jiaotong University majoring in financial management, _______basketball in NBA for nine years.
A.has played
B.was playing
C.has been playing
D.played
说明锅炉一次风机的拖动电动机(YSOF型)供油装置的油泵及电动机的主要技术参数。