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單項(xiàng)選擇題

經(jīng)緯儀視準(zhǔn)軸檢驗(yàn)和校正的目的是（）

A.使視準(zhǔn)軸垂直橫軸
B.使橫軸垂直于豎軸
C.使視準(zhǔn)軸平行于水準(zhǔn)管軸

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單項(xiàng)選擇題

當(dāng)經(jīng)緯儀豎軸與目標(biāo)點(diǎn)在同一豎面時(shí)，不同高度的水平度盤讀數(shù)（）

Ａ.相等；
Ｂ.不相等；
Ｃ.有時(shí)不相等

單項(xiàng)選擇題

當(dāng)經(jīng)緯儀的望遠(yuǎn)鏡上下轉(zhuǎn)動(dòng)時(shí)，豎直度盤（）。

Ａ.與望遠(yuǎn)鏡一起轉(zhuǎn)動(dòng)；
Ｂ.與望遠(yuǎn)鏡相對(duì)運(yùn)動(dòng)；
Ｃ.不動(dòng)

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