（）适用于输送量小，压头高，而粘度不大的液体。
A.旋涡泵
B.往复泵
C.齿轮泵
参考答案：A
—Shall we meet at six o'clock?
—We had better meet a little late. Let's_______seven o'clock. [ ]
A. to make it at
B. to make it
C. make it at
D. make it
完善考录制度，按照（）和公开、平等、竞争、择优的原则。
