题目内容
(请给出正确答案)
[单选题]
预防性含氯消毒液浓度为多少()
A.100ppm
B.500ppm
C.1000ppm
D.2000ppm
答案
B、500ppm
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A.100ppm
B.500ppm
C.1000ppm
D.2000ppm
B、500ppm
A.500mg/L,30min
B.400mg/L~700mg/L,30min
C.1000mg/L,30min
D.500mg/L~1000mg/L,30min
A.清水5500ml,原液50ml
B.清水5840ml,原液160ml
C.清水5940ml,原液60ml
D.清水5860ml,原液140ml
A.500mg/L,30分钟
B.1000mg/L,30分钟
C.500mg/L,20分钟
D.1000mg/L,20分钟