题目：
国家规定化学耗氧量（重铬酸钾法）最高容许排放浓度为（）㎎/l。
A、100
B、200
C、300
D、400
答案：
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国家规定化学耗氧量（重铬酸钾法）最高容许排放浓度为（）㎎/l。A、100 B、200
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