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【单选题】
亚硝酸钠定滴法开始时,将滴定管尖端插入液面下约2/3处的原因是A.
重氮化反应速率减慢
B.
重氮化反应速率加快
C.
避免HNO3挥发和分解
D.
避免HBr挥发
E.
保持30℃以下
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【单选题】I was eleven when we had to move out of the big old house in which I had spent my whole life. Each time I thought of that, I felt very sad. When the final day came, I ran to a corner and sat alone, tr...
A.
were too sorry to leave
B.
were both unwilling to say goodbye to
C.
felt sorry when they were in
D.
didn't know that they had to leave
【简答题】06 2013年12月B级真题.mp3: 请把正确答案的字母填入相应的空格。 Section A A. No, thank you ; B. Yes, this way, please; C. My pleasure D. You're right. A. Ok, thank you; B. It doesn't matter; C. It's over there; D. You're righ...
【简答题】选择合适的单词填空，填序号。 Mary is a little girl. She is only five. She __ 1 __ go to school. She doesn't know how to read 2__ write. But her sister Joan is a school girl. She is ten. She 3 how to read 4 write. O...
【简答题】听力(15分) (一)听句子,选择恰当的应答语。(每个句子读两遍。) 1.A.I don't think so. B.Thank you. C.I have too much pressure about study. 2.A.You should say sorry. B.That's right. C.You are wrong. 3.A.It doesn't matter. B.Her...
【简答题】（Unit 9 Task 2）（6）A: I would like to apologize for the mistake. B: It doesn't .A. matter
【简答题】输出1000以内个位是6,并且能被9整除的数,5个一行,同时显示出共有多少个数。
【简答题】大强度作业的特点是
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