Please call me ______324-5583.[ ]
A. for
B. in
C. at
D. on
答案：C
斜巷施工时，进入现场之前，必须将斜巷上口附近（）以内混杂物清理干净，并设忖人监护看守，以防物坠落伤人
A、4m
B、5m
C、10m
D、20m
The process whereby software is installed into an operational environment is called "______".
A．deployment
B．development
C．setup
D．lay up
