潜水泵工作时,水泵周围()以内水面,不得有人、畜进入。
A.15m;
B.20m;
C.25m;
D.30m
参考答案:D
The premier said the nation’s development should not only promote economic growth , but also pursue social fairness and justice to every individual’s all-round development in a free environment.
A.urge
B.insure
C.ensure
D.satisfy
()是违反设备安全操作规程的。