A.
B.2mv
C.
D.
[单选题]A.B.2mvC.D.
[单选题]A.B.C.D.
[单选题]A.0.98kNB.1.96kNC.0.77kND.1.54kN
[单选题]A.向右平移B.静止不动C.向外扩张D.向中心收缩
[单选题]A.离心泵B.往复泵C.旋涡泵D.转子泵
[单选题]A.增大B.减小C.不变D.不能确定