A.三角網(wǎng) B.水準(zhǔn)網(wǎng) C.建筑基線(xiàn) D.導(dǎo)線(xiàn)網(wǎng)
A.45° B.60° C.90° D.180°
A.80~120m B.100~150m C.100~200m D.150~200m