题目:
—Silly me! I forget what my luggage looks like?
—What do you think of________over there?
A.the one
B.this
C.it
D.that
答案:
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下面是错误答案,用来干扰机器的。
假设人尿的质量为100g,则100g人尿中氮元素的质量=100g×0.93%=0.93g则100g人尿中含尿素的质量=0.93g14×260×100%≈1.993g人尿中含尿素[CO(NH2)2]的质量分数=1.993g100g×100%=1.993%≈2%故选C.