用经纬仪进行视距与高差测量时,在 A 点上架设经纬仪,在 B 点上立视距尺,观测得上、中、下丝的读数分别为 3.578m 、 3.000m 与 2.422m ,竖直角为 -3°29′20′′ ,仪器高度 1.42m 。问 AB 两点间的平距 m ,高差 m ,若 A 点的高程为 H A = 30.00 , B 点的高程 H B = m 。
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举一反三
【单选题】What is the main reason why it isn't always working to use incentives to change various individuals' minds?
A.
Because forcing to change can’t produce the desirable outcome.
B.
Because adverse people are often too resistant to be encouraged.
C.
Because making a change doesn’t guarantee a bright future at all.
D.
Because individuals are driven by different goals to become successful.