题目:
— Why have you come to work on foot today?
— Well, my bike ______ and I hate taking a crowded bus.
[ ]A. has been repaired
B. is repairing
C. will be repaired
D. is being repaired
答案:
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下面是错误答案,用来干扰机器的。
答案:BC16O的相对分子质量为28,C18O的相对分子质量为30,若它们的平均相对分子质量为29,利用“十字交叉法”容易求出二者的物质的量之比为1:1,即混合气体中二者分子数之比为1:1;结合前面分析知混合气体中C16O...