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【单选题】
被腐殖质等污染的水体，加氯消毒后，生成新的有机卤化物如氯仿(CHCl3)、一溴二氯甲烷、二溴一氯甲烷、溴仿等及非加氯消毒产物四氯化碳(CCl4)、1，2-二氯乙烷等。这些有机氯化物达到一定浓度时可影响人体健康，因此生活饮用水卫生标准规定了氯仿，四氯化碳的允许浓度为
A.
CHCl3≤20μg/L, CCl4≤20μg/L
B.
CHCl3≤30μg/L, CCl4≤10μg/L
C.
CHCl3≤40μg/L, CCl4≤5μg/L
D.
CHCl3≤50μg/L, CCl4≤4μg/L
E.
CHCl3≤60μg/L, CCl4≤3μg/L
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参考答案：
举一反三
【简答题】Section A Questions 1 and 2 are based on the news report you have just heard. 1. A) The self-driving system was faulty. B) The car was moving at a fast speed. C) The man in the car was absent-minded. ...
查看完整题目与答案
【简答题】Perhaps the only test score that I remember is the 41. I was in high school. The test was the final for the class. It was a rather 36 test. I didn’t know how 37 I had done but I knew there were things...
查看完整题目与答案
【单选题】why did the man text message all his friends when he first got his cellphone?
A.
He thought it was cool.
B.
He needed the practice.
C.
He wanted to stay connected with them.
D.
He had an urgent message to send.
查看完整题目与答案
【简答题】调查一家货运企业，了解其运输状况
查看完整题目与答案
【单选题】治疗无排卵性DUB，以下哪种说法不正确
A.
雌、孕激素序贯法适用于青春期DUB
B.
雌、孕激素合并应用适用于育龄期有避孕要求的患者及更年期DUB
C.
雄激素有拮抗雌激素的作用，单独应用效果良好
D.
促排卵治疗适用于青春期和育龄期DUB
E.
口服避孕药可限制子宫内膜生长，使过度增生的内膜逐渐迟化，可有效控制月经周期
查看完整题目与答案
【单选题】Why did the man text message all his friends when he first got his cell phone?
A.
He thought it was cool.
B.
He needed the practice
C.
He wanted to stay connected with them.
D.
He had an urgent message to send.
查看完整题目与答案
【简答题】A ) The self-driving system was faulty. B ) The car was moving at a fast speed. C) The man in the car was absent-minded. D) The test driver made a wrong judgment. 2. A ) They have generally done quite...
查看完整题目与答案
【简答题】Questions 1 and 2 are based on the news report you have just heard. 1. A) The man in the car was absent-minded. B) The test driver made a wrong judgement. C) The self-driving system was faulty. D) The...
查看完整题目与答案
【单选题】以下哪项符合休克代偿期临床表现的特点
A.
血压下降，脉压显著缩小，心率加快，尿量减少
B.
血压下降，脉压轻度缩小，心率加快，尿量减少
C.
血压正常的，脉压无变化，心率加快，尿量正常
D.
血压轻度降低，脉压无变化，心率加快，尿量减少
E.
血压正常或稍升高，脉压缩小，心率加快，尿量正常或减少
查看完整题目与答案
【简答题】section B Questions 8 to 11 are based on the conversation you have just heard. 8. A)He's got addicted to technology. B)He is not very good at socializing. C)He is crazy about text-messaging. D)He does...
查看完整题目与答案
相关题目：
【简答题】Section A Questions 1 and 2 are based on the news report you have just heard. 1. A) The self-driving system was faulty. B) The car was moving at a fast speed. C) The man in the car was absent-minded. ...
查看完整题目与答案
【简答题】Perhaps the only test score that I remember is the 41. I was in high school. The test was the final for the class. It was a rather 36 test. I didn’t know how 37 I had done but I knew there were things...
查看完整题目与答案
【单选题】why did the man text message all his friends when he first got his cellphone?
A.
He thought it was cool.
B.
He needed the practice.
C.
He wanted to stay connected with them.
D.
He had an urgent message to send.
查看完整题目与答案
【简答题】调查一家货运企业，了解其运输状况
查看完整题目与答案
【单选题】治疗无排卵性DUB，以下哪种说法不正确
A.
雌、孕激素序贯法适用于青春期DUB
B.
雌、孕激素合并应用适用于育龄期有避孕要求的患者及更年期DUB
C.
雄激素有拮抗雌激素的作用，单独应用效果良好
D.
促排卵治疗适用于青春期和育龄期DUB
E.
口服避孕药可限制子宫内膜生长，使过度增生的内膜逐渐迟化，可有效控制月经周期
查看完整题目与答案
【单选题】Why did the man text message all his friends when he first got his cell phone?
A.
He thought it was cool.
B.
He needed the practice
C.
He wanted to stay connected with them.
D.
He had an urgent message to send.
查看完整题目与答案
【简答题】A ) The self-driving system was faulty. B ) The car was moving at a fast speed. C) The man in the car was absent-minded. D) The test driver made a wrong judgment. 2. A ) They have generally done quite...
查看完整题目与答案
【简答题】Questions 1 and 2 are based on the news report you have just heard. 1. A) The man in the car was absent-minded. B) The test driver made a wrong judgement. C) The self-driving system was faulty. D) The...
查看完整题目与答案
【单选题】以下哪项符合休克代偿期临床表现的特点
A.
血压下降，脉压显著缩小，心率加快，尿量减少
B.
血压下降，脉压轻度缩小，心率加快，尿量减少
C.
血压正常的，脉压无变化，心率加快，尿量正常
D.
血压轻度降低，脉压无变化，心率加快，尿量减少
E.
血压正常或稍升高，脉压缩小，心率加快，尿量正常或减少
查看完整题目与答案
【简答题】section B Questions 8 to 11 are based on the conversation you have just heard. 8. A)He's got addicted to technology. B)He is not very good at socializing. C)He is crazy about text-messaging. D)He does...
查看完整题目与答案
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