[单项选择]据研究,可污染饮用水的致病微生物有上百种,为杜绝介水传染病的发生和流行,保证人体健康,可以采用臭氧进行消毒,那么臭氧消毒的特点是() A. 效果好、用量少、接触时间短、不产生三卤甲烷 B. 效果差、费用高、pH值宽 C. 效果好、接触时间长、不产生三卤甲烷 D. 效果一般、费用高、pH值窄 E. 效果好、费用高、不产生三卤甲烷
第32题: [单项选择]What did you learn about the man A. It was hard going. B. It was fairly successful. C. It failed for lack of money. D. It stopped for want of land. 参考答案:B 答案解析:[听力原文] W: How did Mr. Rogers project turn out I heard he had trouble with the financing and he t