單項選擇題沉降觀測等級為二等,水準測量兩次讀數(shù)所測高差這差限差為()mm。

A.0.3
B.0.5
C.0.7
D.1.5


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5.單項選擇題二等水準采用中絲讀數(shù)法,每站觀測順序為()

A.往測:奇數(shù)站,后-前-前-后;偶數(shù)站,前-后-后-前、返測:奇數(shù)站,前-后-后-前;偶數(shù)站,后-前-前-后
B.往測:奇數(shù)站,前-后-后-前;偶數(shù)站,后-前-前-后、返測:奇數(shù)站,后-前-前-后;偶數(shù)站,前-后-后-前
C.往測:奇數(shù)站,后-后-前-前;偶數(shù)站,前-前-后-后、返測:奇數(shù)站,前-前-后-后;偶數(shù)站,后-后-前-前
D.往測:奇數(shù)站,前-前-后-后;偶數(shù)站,后-后-前-前、返測:奇數(shù)站,后-后-前-前;偶數(shù)站,前-前-后-后