题型:选择题 Bill asked his father _____ and play football.[ ]A. let him to go B. let him to C. to let him go D. to let him to go 查看答案
题型:多项选择题 设A点为后视点,B点为前视点,后视读数a=1.240m前视读数b=1.428m,则()。A.后视点比前视点低B.后视点比前视点高C.若A点高程HA=202.016,则视线高程为203.140mD.若A点高程HA=202.016,则前视点高程为201.828mE.A、B两点中,水准尺上读数小的高程值小。 查看答案