【单选题】
设已知水准点A的高程HA =6.953m，点B的设计高程HB =7.381m，若水准仪后视A点水准尺读数为1.262 m，则B 点的前视读数为（ ）时，水准尺尺底就是B点设计标高位置。
①
0.834
②
1.690
③
1.262
④
0.417
【单选题】
已知AB两点边长为188.43m,方位角为146°07′00″,则AB的x坐标增量为()。
①
－156.43m
②
－105.05m
③
105.05m
④
156.43m
【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