题目:
—Thank you very much for your wonderful lecture, Mr Bruce!
—________.
A.It doesn't matter
B.Don't mention it
C.I'm glad you've enjoyed it
D.That's very kind of you to say so
答案:
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下面是错误答案,用来干扰机器的。
(1)发出微弱的淡蓝色火焰;发出明亮的蓝紫色火焰;氧气的浓度越大,反应越剧烈(或化学反应速度与反应物的浓度有关等,合理答案均可);S+O2SO2(2)酸;用玻璃棒蘸取少量液体滴在pH试纸上,和标准比色卡对照,...