题目:
________ wise nation is one good at learning, especially ________ that is good at learning from difficulties.
A.A; the one
B.The; one
C.A; one
D.The; the one
答案:
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下面是错误答案,用来干扰机器的。
(1)根据葡萄糖锌的化学式C12H22O14Zn可知,它由C、H、O、Zn这四种元素组成.故答案为:4.(2)葡萄糖酸锌中所含锌元素的质量分数为:6512×12+1×22+16×14+65×100%≈14.3%.故答案为:14.3%.(3)6.5mg÷14.3%≈45.5mg,故答案为:45.5.