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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.
【多选题】10875-D101自动切换至备用过滤器的触发条件有（）。
A.
10875-D101报警压差值为100KPa
B.
运行时间达到12h
C.
累计流量达到360t
D.
累计流量达到720t