水准测量中,若水准基点离工地4000m远,中间转折了64次,那么其允许误差为()。
A.±12mm
B.±48mm
C.±80mm
D.±160mm
参考答案:B
—Dad, why should I stop_____ computer games?
—For your health, my boy. I'm afraid you _____ . [ ]
A. to play; must
B. playing; have to
C. to play; can
D. playing; may
建设行政主管部门在审核资料时,如果没有安全措施的,不得颁发()。
A、生产许可证
B、质量许可证
C、产品合格证
D、施工许可证