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【单选题】
用液体吸收法采集二氧化硫时，为什么用四氯汞钠作吸收液，而不用稀碱液做吸收液A.
二氧化硫在水中溶解度小
B.
四氯汞钠和二氧化硫可迅速生成不挥发的络合物，防止二氧化硫在采样过程被氧化
C.
汞是二氧化硫和盐酸副玫瑰苯胺的催化剂
D.
二氧化硫和稀碱液可形成亚硫酸钠易水解
E.
四氯汞钠参与二氧化硫和盐酸副玫瑰苯胺的反应
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【简答题】听短文，填空。 Information Sheet 1. This year's Language Study Show is _________ between the 17th and the 19th of March at the National Center. 2. You can see and get ideas on everything to help you ________...
【单选题】听力原文：M: Excuse me. Are you going to buy concert tickets? W: Yes, I am. So are all these people in front of me. M: Have you been here long? W: About 45 minutes. I've moved forward a total of about 3 fe...
A.
She's impressed with the ticket sellers.
B.
She's pleased about the man's purchase.
C.
She's uncertain about the change in plans.
D.
She's resigned to the situation.
【单选题】在社会主义道路探索时期,以下哪一项不是由毛泽东提出的思想()
A.
统筹兼顾,正确处理国家、集体和个人的关系
B.
注意发展手工业和农业多种经营的思想
C.
“两参一改三结合”的思想
D.
“两条腿走路”的方针
【单选题】听力原文：M: Excuse me, are you waiting to buy concert tickets? W: Yes, I am. So are all these people in front of me. M: Have you been here long? W: About 45 minutes. I've moved forward a total of about 3 ...
A.
Calling someone.
B.
Attending a concert.
C.
Waiting in line.
D.
Canceling reservation.
【单选题】在社会主义道路探索时期,以下哪一项不是由毛泽东提出的思想。0
A.
统筹兼顾，正确处理田家、集体和个人的关系
B.
注意发展手工业和农业多种经营的思想
C.
“两参一改三结合”的思想
D.
“两条腿走路”的方针
【单选题】听力原文：M: Excuse me. Are you going to buy concert tickets? W: Yes, I am. So all these people are in front of me. M: Have you been here long? W: About 45 minutes. I've moved forward a total of about 3 fe...
A.
She's impressed with the tickets sellers.
B.
She's pleased about the man's purchase.
C.
She's uncertain about the change in plans.
D.
She's resigned to the situation.
【单选题】在社会主义道路探索时期,以下哪一项不是由毛泽东提出的思想。
A.
统筹兼顾，正确处理国家、集体和个人的关系
B.
“两参一改三结合”的思想
C.
“两条腿走路”的方针
D.
注意发展手工业和农业多种经营的思想
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