问题
问答题 简答题
树状网计算时，干线和支线如何划分，两者确定管径的方法有何不同？
答案
参考答案：
树状网计算时，干线是指从二级泵站到控制点的管线，而支线是指管网中除干线以外的其他管线。干线确定管径是按照流量以经济流速求出管径，而支线是按照水力坡度选定相近的标准管径。
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树状网计算时，干线和支线如何划分，两者确定管径的方法有何不同？
参考答案：
树状网计算时，干线是指从二级泵站到控制点的管线，而支线是指管网中除干线以外的其他管线。干线确定管径是按照流量以经济流速求出管径，而支线是按照水力坡度选定相近的标准管径。
| 用方框中所给单词的适当形式填空，使短文完整正确、（每个单词限用一次）。 | |
the "New York Times" says China's most l writer is Guo Jingming, whom some Chinese readers claim is the best 2 . In "China's Pop Fiction" , published recently, Aventurina King wrote that 24-year-old Guo is a popidol(偶像) whose "crossing-dressing.and persona(形象) " 3 him a hit in China. And the "New York Times" article 4 to mean that Guo is the most commercially successful writer. But many of the SohLl responders 5 __ the young writer has not fully developed in literature and his showy persona is unacceptable 6 Chinese standards. Some others think that Guo is successful for his best-selling books. Guo is successful more than any 7 Chinese writer last year, according to the annual list of millionaire writer. He tops the list with 11 million yuan in copyright royalties(版权税) , 8 Yu Qiuyu, a famous scholar and the richest writer of 2006. Guo tolcl the "Chongqing Evening News" in a recent 9 that he hadn't yet read the "New York Times" story, but that the honor was inspiring. He says a successful writer is someone 10 books are favored by readers. |
下列混合物中不属于溶液的是据此数据，判断下列说法正确的是（ ）
| 温度/℃ | 20 | 40 | 60 | 80 |
| 溶解度/g | 40 | 50 | 58 | 68 |
A．20℃时，氯化铵饱和溶液中氯化铵的质量分数是25%
B．20℃时，70g氯化铵的饱和溶液升温至40℃得到不饱和溶液
C．40℃时，75g氯化铵的饱和溶液中加入25g水后氯化铵的质量分数为30%
D．80℃时，84g的氯化铵饱和溶液降温至60℃时有5g氯化铵析出