下载APP
【单选题】
水厂常用的石英砂滤料粒径一般为：（）
A.
0.3-0.5mm
B.
0.5-1.0mm
C.
0.8-1.2mm
D.
1.2-1.5mm
举报
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】接触双层滤料滤池的特点是（）。
A.
对滤前水的浊度适用幅度大，因而可以作为直接过滤
B.
条件合适时，可以不用沉淀池，节约用地，投资省
C.
降速过滤，水质较好
D.
以上均正确
【单选题】When stars like our Sun die, they bloat to become red giants and then eject gigantic clouds of gas and dust into space. Increasingly, however, scientists found themselves at a profound loss to explain...
A.
explain-the possible way of death of our Sun.
B.
show the two types of red giants.
C.
discuss on the way of red giants to become white dwarfs.
D.
explore the origin of life.