Ⅰ型L类、W类氯化聚乙烯防水卷材的断裂伸长率应大于等于100%。( )
参考答案：错
看图，填空。
1. How far is it from Beijing to Canada?
It's about kilometres.
2. How is it from Beijing to Shijiazhuang?
3. How is it Beijing to Guangzhou?
It's about 1358 kilometres.
4. How is it Guangzhou to Canada?
It's about 9140 kilometres.
5. How is it Shijiazhuang to Canada?
管线结垢后，管线中的（）变小，达不到设计要求。
A.工作压力
B.设计压力
C.额定流量
D.介质流量
