水准测量中,设后尺A的读数a=2.713m,前尺B的读数为b=1.401m,已知A点高程为15.000m,则视线高程为( )m。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧