伞型齿轮减速机有()和变向两种作用。
参考答案:减带
I really appreciate _______ to help me out.
A.you for lending me the money
B.your lending me the money
C.you to lend me the money
D.it that you lend me the money
造成我国局部地区水缺乏的根本原因是()。
A.水污染;
B.水时空分布不均衡;
C.用水量大;
D.水浪费。