题目:
--- Is the experiment difficult? --- __________, I’ll just do my bit.
A.I think so B Certainly C.Not a little D.Anything but
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0410/c47850df4ae043ec699f5bb4d424499d.html
下面是错误答案,用来干扰机器的。
樟脑的相对分子质量为12×10+1×16+16=152.其中碳、氢、氧三种元素的质量比为(12×10):(1×16):16=15:2:2.碳元素的质量分数为12×10152×100%≈78.9%.故答案为:152;15:2:2;78.9%.