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查阅资料知道，鸡蛋壳的主要成分是碳酸钙．某同学为了验证鸡蛋壳的主要成分是碳酸钙，设计了如图的实验． （1）实验过程中看到的现象是______． （2）小明认为该实验方案不完整，还需验证鸡蛋壳的主要成分属于钙盐，方法是取反应后的上层清液加入______（填字母）． A．Na 2 CO 3 溶液 B．AgNO 3 溶液 C．NaCl溶液 D．Ca（OH） 2 溶液 （3）鸡蛋壳与盐酸反应的化学方程式为______．
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举一反三
【单选题】原文:我不信,人家学得会,咱就学不会? 译文: I don’t believe that others could learn to do it but we could not.
A.
及物与不及物动词误译
B.
时态错误
C.
冠词误译
D.
逐词对译与语法问题
【单选题】We used to believe that life could not exist under extremely hot or cold environment.
A.
Y
B.
N
C.
NG
【简答题】We could not believe the _____ of the hotel receptionist, who had given our room to someone else.(stupid)
【简答题】A. compare B. disappointed C. However D. impossible E. inside F. among G. doctors We wish that we could be better at sports or more attractive. We wish we had nicer clothes or m ore money. E...
【简答题】One day, the students of Class 6 were reading in the classroom. Mrs Brown came in and told the whole class that they would have to change 1 in March. The naughtiest class in the grade could not believ...
【简答题】翻译 (1)They are preparing for the party. (2)Bob is arriving in London. (3)No matter what he said,we could not believe him.
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