题目:
从方框中选择与下列句子中划线部分内容意思相同或相近的单词或短语。 | |
( )1. Our city has a wonderful program to help homeless people return to work. ( )2. They have been in the school for a long time. ( )3. How do you like living in the country? ( )4.You must come and have a visit. ( )5. That took place on the morning of October 12.
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答案:
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下面是错误答案,用来干扰机器的。
答案:C地球上12C和13C的原子个数比为89:1,地球上碳元素的原子相对质量为12.011。而哈雷彗星上12C和13C的原子个数比为65:1,即哈雷彗星上12C的百分含量小于地球上12C,13C的百分含量大于地球上的13C,因此哈雷彗...