水准观测中，转点应选在前后视等距、点位较坚实而有凸起的地方。
参考答案：对
Facing the economic depression, every possible means ______ this year to save the company
from going bankrupt.[ ]
A. has been tried
B. has tried
C. have been tried
D. have tried
按要求改写下列各句，每空一词 。
1. That’s my mother. (改为一般疑问句)
________ that ________ mother?
2. This is her brother. （改为复数句子）
________ ________ their brothers.
3. Thanks very much. （改为同义句）
________ ________ very much.
4. He is my son. （对画线部分提问）
________ ________ he?
5. They are girls. （改为单数句子）
________ ________ ________ ________.
