在起重机构中,长细比一般小于()。
A、90
B、100
C、120
D、150
参考答案:B
—It is too noisy here. I can' t stand it.
—Me. too. We have to ______ new ways to solve the problem.
A. catch up with
B. keep up with
C. come up with
D. make up with
简述机械化蓄水保墒耕作技术。