在坝顶、陡坡屋顶、悬崖、杆塔吊桥以及其他危险的边沿进行工作,临空一面应装设()或(),否则,工作人员须使用().
参考答案:安全网;防护栏杆;安全带
氟利昂12有哪些特性?
Speaker A: Excuse me, could you tell me how to get to the railway station Speaker B: ()。
A. Yes, of course I can.
B. Well, you’d better not ask a stranger.
C. Sorry. I’m a stranger here myself.
D. Yes, you can take a taxi. It’s more expensive, but it’s quicker.