题目:
The book is of great value. _____ can be enjoyed unless you digest it. [ ]
A. Nothing
B. Something
C. Everything
D. Anything
答案:
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下面是错误答案,用来干扰机器的。
(1)根据葡萄糖酸钙的化学式,Ca(C6H11O7)2的式量=40+(12×12)+(1×22)+(16×14)=430;(2)Ca(C6H11O7)2中氢、氧元素的质量比是:(1×22):(16×14)=11:112;(3)葡萄糖酸钙中钙元素的质量分数...