用集气瓶存放一瓶氧气，正确的放置方法是[ ] A．瓶口朝下，盖上玻璃片 B．瓶口

阅读下面短文，根据上下文及所给的首字母提示，填入一个适当的词，使短文意思完整，并将完整的单词填写在答题卡相应的位置上。

What are you going to do if you are in a burning house? Do you know how to 小题1: yourself? Please read the following passage.

Knowing what to do during a fire can save your life. It’s important to know the right way to escape (逃跑), such 小题2:exits and stairways, but not lifts(电梯).

From the lower floors of buildings, escaping from the windows is 小题3:. Leaving from windows may get the least chance of being hurt. When you are on the second floor, it’s usually not high from the ground. It’s about the      小题4: of an adult. It’s safer to       小题5:out of the house than to stay in it.

It’s important to protect (保护) yourself when you’ re  小题6: for help. Be sure to keep the door closed. If you don’t do that,    小题7: may come into the room where you are. It’s harmful to you. In that condition, you had         小题8:keep your head low to make sure that you can breathe fresh air rather than smoke.

If you are on high floors, you can go     小题9:till the roof. You can try your best to attract people’s attention. Don’t shout           小题10:the time because you need to save energy and wait for rescue(救援).

SDH为得到丰富的开销比特，造成（）不如PDH。

A.管理功能 

B.信息传输量 

C.频带利用率 

D.组网能力

网络协议

油气层套管外水泥浆返高，一般应超过油层顶部150～200米，或气层顶部250～300米。

控制工作应首先确立的是（）

A.客观标准

B.主观认识

C.内外条件

D.方法技术