John is a man of his word. If he promise

液体中有杂物使离心泵（）造成转动不平衡，振动增大。

A.叶轮磨损

B.扩压室磨损

C.密封磨损

D.叶轮抗磨环磨损

The new invention may _____ changes in the way they do their work. [ ]

A. result from

B. expose to

C. lead to

D. put forward

非空的循环单链表head的尾结点(由p所指向)，满足

A．p→next==NULL

B．p==NULL

C．p→next=head

D．P=head

商家不可以自己在商家后台修改店铺名称。

试述发展我国投资基金的意义。