【单选题】
设A为后视点，B为前视点，A点高程为36.750 m,后视读数为0.947 m ,前视读数为1.279 m ,则A.B两点的高差是()
①
-0.332m
②
0.332m
③
37.082
④
36.418
【单选题】
A点坐标为（10、20、30），B点坐标为（30、20、30）则AB距离为______。
①
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铅垂线
【单选题】
在水准测量中，设点A为后视点，点B为前视点，点A处尺的读数为1.213m，点B处尺的读数为1.401m，点A高程为21.000m，则视线高程为()m。
①
22.401
②
22.213
③
21.812
④
20.812
【单选题】
某工程采用假定高程系统，测得A点的假定高程为1165.325，B点假定的高程为1188.684。后来测得A点的绝对高程为1205.476，测B点的绝对高程为（ ）。
①
1148.533
②
1128.835
③
1048.533
④
1228.835