叶片泵是利用叶片和液体相互作用来输送液体的。
参考答案：对
_________ may have a chance to be successful if he tries his best.
A．Somebody
B．Everybody
C．Nobody
D．None
个人网银客户关联账户累计总数不超过（）个。
A.5个
B.10个
C.20个
D.30个
