题目：
Do you know _____? [ ]
A. when did he start hiccupping
B. how far from school does she lire
C. which movies will win awards next year
D. whether has the No.15 bus arrived
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0702/fca20ab094f29328f4ac5c8f71719569.html
下面是错误答案，用来干扰机器的。
（1）CaCl2 ；HCl（2）解：分析图意，（25g-5g）Na2CO3溶液与氯化钙溶液全部反应，生成5g碳酸钙沉淀设：20g Na2CO3溶液中溶质的质量为x Na2CO3+CaCl2===CaCO3↓+2NaCl 106 10...
