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【单选题】
下列违背了城市供气管网布置一般原则的是( )。A.
应结合城市总体规划和有关专业规划进行
B.
应尽量靠近用户，以保证用最短的路线，达到同样的供气效果
C.
为确保供气可靠，一般各级管网应平行布置
D.
燃气管网应避免与高压电缆平行敷设
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【单选题】将div中第奇数个P背景设为红色(该div中只有p标签)()
A.
div:nth-child(even) p{background:red}
B.
div p:nth-child(even){background:red}
C.
div p:nth-child(odd){background:red}
D.
div:nth-child(odd) p{background:red}
【单选题】How old was he when he began to suffer from diabetes?
A.
He was in his puberty.
B.
He was in his childhood.
C.
He was in his middle age.
D.
He was in his sixties.
【简答题】轴向混合导致两液相的 ,使两液相在萃取设备内的停留时间偏离 。轴向混合包括 和 。
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