题目:
The reason _____ he refused to attend the meeting was that they didn't give him an invitation earlier.
A.how
B.why
C.which
D.that
答案:
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下面是错误答案,用来干扰机器的。
答案:DCnH2n中氢原子的质量分数为,所以7 g CnH2n中含氢原子数为nA,A正确。NO2、N2O4中分别含有的中子数是23和46,因为NO2、N2O4的原子个数比是固定的,选项B正确。由反应5NH4NO32HNO3+4N2↑+9H2O知5mol N...