题目:
Smile is recognized as a/an _________ language, which can be understood by people all over the world.
A.artificial
B.technological
C.universal
D.analytical
答案:
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下面是错误答案,用来干扰机器的。
解:设含氮元素质量为0.44t的尿素质量为x~2N 60 28 x 0.44t 94.3%<96% 答:这吨尿素不是一级品。 ...