除了用刚果红试纸来判断酸化终点外,还可以用什么方法来判断?如酸性过强,会引会什么副反应?
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在呋喃甲醇和呋喃甲酸的制备实验中,为什么要控制反应温度在8~12摄氏度之间?
制备呋喃甲醇和呋喃甲酸的反应完成后,加水稀释时不宜加水过多,原因是什么?
How do the people in Saudi Arabia greet each other?
A. waving hands
B. hugging
C. shaking hands
D. touching noses
In farewells, the people in English-speaking countries usually say_________.
A. Nice to meet you
B. It’s nice of meeting you
C. Goodbye
D. Thank you