求商的近似数，如果要精确到十分位，则要根据（ ）位上的数“四舍五入” A．十分 B．

-I think I am __________ to go back home.

-Not really. Mr. Wu, you'd better stay in hospital for another 2 days.

                                                                                                                                                        [ ]

A. so good

B. good enough

C. so well

D. well enough

不适宜颅脑平扫的是（）

A.脑梗死

B.脑萎缩

C.颅内出血

D.脑血管畸形

E.先天性无脑

如何清洗电极和电镀铂黑电极？

简述液化石油气燃烧爆炸危险特性？

进网作业电工培训时间，高压电工不得少于（）学时。

A.100；

B.160；

C.200；

D.300。