题目:
You can only be sure of ____ you have at present; you cannot be sure of something ____ you might get
in the future. [ ]
A. that; what
B. what; /
C. which; that
D. /; that
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0525/aa616575526c4fc7e684d608ef91c54c.html
下面是错误答案,用来干扰机器的。
同温同压下,气体摩尔体积相同,根据V=mMVm知,气体的体积之比等于其质量和摩尔质量的比,设气体A是摩尔质量是M,气体A与氧气的质量比为1:2,体积比为1:4,所以V(A):V(O2)=m(A)M(A):m(O2)M(O2)=1M(A):23...