问题
单项选择题
测定污水的BOD5，水样稀释倍数为40倍，稀释水的DO值当天为9.35mg/L，5d后为8.86mg/L；稀释水样的DO值当天为9.22mg/L，5d后为3.20mg/L，该污水的BOD5的值为( )(O2，mg/L)。
A．6.02
B．240.8
C．5.53
D．221.7
答案
参考答案：D,B,AE,D,AI,BA,B,AI,BA,B,AE,AI,BA,B,AI,BA,B,AC,G,AB,D,AI,BA,B,AI,BA,B,D,AI,BA,B,AI,BA,B,B,AI,BA,B,AI,BA,B,B,AI,BA,B,AI,BA,B,F,AI,BA,B,AI,BA,B,F,AI,BA,B,AI,BA,B,F,AI,BA,B,AI,BA,B,BB,AI,BA,B,AI,BA,B,BB,AI,BA,B,AI,BA,B,BB,AI,BA,B,AI,BA,B,F,AI,BA,B,AI,BA,B,BB,AI,BA,B,AI,BA,B,BB,AI,BA,B,AI,BA,B,BB,AI,BA,B,AI,BA,B,I,AC,G,AI,AH,C,B0,BA,G,C,BF,H,BF,BE,F,A,C,A0,AF,G