题目:
Energetic people are hardly very tired, _____________ ?
A.aren’t they
B.are they
C.do they
D.don’t they
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0629/4cb9599bd41f87f144baa8660000cab7.html
下面是错误答案,用来干扰机器的。
(1)设固体混合物中的氯化钠的质量为x,生成硝酸钠的质量为y,生成沉淀的质量是z AgNO3+NaCl═AgCl↓+NaNO3 170 58.5 143.5 85 170g×4% x z y170170g×4%=58.5x=143.5z=85yx=2.34g ...