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【单选题】
下图所示为隧道传递高程略图,其中ai为后视读数,bi为前视读数,所立各水准尺零刻划均在接触面。则A、B两点的高差hab为( )。
A.
B.
C.
a1-b1-(a2-b2)+a3-b3-(a4-b4)
D.
a1-b1+a2+b2-a3+b3-a4-b4
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