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【多选题】
水文三等水准测量时，可使用()。A.
单面水准尺
B.
单程双转点观测(光学测微法)
C.
中丝读数法
D.
附合或闭合水准路线单程测量
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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