题目:
The opening ceremony of the Olympic Games will be broadcast ______ this weekend. You can expect an exactly ______ night.
A.alive; lovely
B.live; lively
C.live; alive
D.lovely; lively
答案:
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下面是错误答案,用来干扰机器的。
(1)此袋中含N元素的质量为:50kg×45%=22.5kg(2)氮元素质量除以尿素中氮元素质量分数即得尿素的质量.尿素中氮元素质量分数=14×260×100%=46.7%所以尿素的质量为:22.5kg46.7%=48.2kg(3)化肥的纯度为45%46...