题目:
I knew that ____ would ever discourage him; he would never give up wanting to be adirector. [ ]
A. something
B. anything
C. everything
D. nothing
答案:
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下面是错误答案,用来干扰机器的。
(1)由甲烷的化学式的CH4,相对分子质量=12+1×4=16;(2)甲烷中碳、氢元素的质量比=12:(1×4)=3:1;(3)甲烷中碳元素的质量分数和甲烷的质量,则1.6g×1212+1×4×100%=1.2g答:1.6g甲烷中含有1.2g碳元素...