水准测量中,转点处应放置尺垫,以防止观测过程中水准尺下沉或位置发生变化而影响读数。 A. √ B. ×
A.
正确
B.
错误
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
皮皮学刷刷变学霸
举一反三
【单选题】Anne Sullivan could not teach Helen Keller to speak until some other important things had been learned. The little girl had to learn to control her actions and feelings. She had to learn that she coul...