第1题: [单项选择]不同测点监测的某Ⅳ类水体pH分别为7.45和6.85,pH单项水质标准指数分别是()。 A. 1.06和0.98 B. 0.23和0.15 C. 0.83和1.14 D. 0.83和0.76 参考答案:B 答案解析:Ⅳ类水体pH环境标准为6~9,pH的标准指数为:当pHj>7时,SpH,j=(7.45-7)÷(9-7)=0.23;当pHj≤7时,S
第13题: [单项选择]Human choice, not the intrinsic content of science, determines the outcome—and scientists, as human beings, therefore have a special responsibility to provide council rooted in ______. A. expiration B. explanation C. expertise D. expenditure 参考答案:C 答案解析:[注释]此题要对词形类似的一组词进行判断,expertise 的意思符合题意。