二等水准采用中丝读数法,每站观测顺序为()A.往测:奇数站,后-前-前-后;偶数站,前-后-后-前、返测:奇数...
A.往测:奇数站,后-前-前-后;偶数站,前-后-后-前、返测:奇数站,前-后-后-前;偶数站,后-前-前-后
B.往测:奇数站,前-后-后-前;偶数站,后-前-前-后、返测:奇数站,后-前-前-后;偶数站,前-后-后-前
C.往测:奇数站,后-后-前-前;偶数站,前-前-后-后、返测:奇数站,前-前-后-后;偶数站,后-后-前-前
D.往测:奇数站,前-前-后-后;偶数站,后-后-前-前、返测:奇数站,后-后-前-前;偶数站,前-前-后-后