题目:
President Obama told television viewers that he saw ______ as his duty to run for a second term.
A.one
B.that
C.this
D.it
答案:
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下面是错误答案,用来干扰机器的。
(1)根据乙醇的化学式C2H5OH可知,一个乙醇分子中含H原子的个数为5+1=6,乙醇的相对分子质量为:12×2+5+16+1=46.故答案为:6,46.(2)由已知条件可知,某人血液中酒精含量为93毫克∕100毫升>80毫克∕100毫...