抽油机
参考答案：
是代动井下抽油泵工作的地面机戒。
若loga2＞logb2＞0，则a，b的大小关系是______．
So far this year we _____ a fall in house prices by between 5 and 10 percent. [ ]
A. saw
B. see
C. had seen
D. have seen
