问题
单项选择题
电源线、信号线穿越上、下或水平穿墙完工后应用（）盖封洞口。
A.延燃材料
B.非延燃和绝缘材料
C.绝缘材料
D.非绝缘材料
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
电源线、信号线穿越上、下或水平穿墙完工后应用（）盖封洞口。
A.延燃材料
B.非延燃和绝缘材料
C.绝缘材料
D.非绝缘材料
参考答案：B
When you are in England, you must be very careful in the streets because the traffic drives on the left. Before you cross a street, you must look to the right first and then the left. If the traffic lights are red, the traffic must stop. Then the people on foot When you are in England, you must be very careful in the streets because the traffic drives on the left. can cross the road. If the traffic lights are green the traffic can go. People on foot mustn’t cross. In the morning and in the evening when people go to or come from work the streets are very busy. Traffic is most dangerous then. When you go by bus in England, you have to be careful, too. Always remember the traffic moves on the left. So you must be careful. Have a look first or you will go the wrong way. In many English cities, there are big buses with two floors. You can sit on the second floor. From there you can see the city very well. It’s very interesting. 小题1:In China, before you cross a street, you must look to first and then .
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