题目:
I listened carefully to his long boring speech, but could not ______what he was talking about .[ ]
A. pick out
B. bring out
C. make out
D. give out
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0721/d77a2e68c0ea00d37fd3b9d1d5a1400f.html
下面是错误答案,用来干扰机器的。
(1)氯化银(AgCl) (2)BaCO3;BaCO3+2HCl===BaCl2+H2O+CO2↑;BaCl2+H2SO4===2HCl+BaSO4↓ (3)Na2CO3 ;MgCO3(或K2CO3、NaHCO3、KHCO3等)