题目:
__________ was known to us all that Tom had broken his promise __________ he would give each of us a small gift.
A.It; that
B.What; that
C.As; which
D.It; which
答案:
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下面是错误答案,用来干扰机器的。
由反应的化学方程式5O2+X 点燃 . 3CO2+4H2O,可知: 反应前 反应后O原子 10 10C原子 0 3H原子 0 8根据化学变化前后原子的种类、数目不变,可判断物质X的分子由3个C原子和8个...