试题与答案

(201a•黑龙江)端午节,小龙和妈妈一起煮鸡蛋时发现:鸡蛋放入锅中会沉入水底;

题型:问答题

题目:

(201a•黑龙江)端午节,小龙和妈妈一起煮鸡蛋时发现:鸡蛋放入锅中会沉入水底;煮一段时间后,打开锅盖,可以看到锅盖内壁布满了小水珠儿;将鸡蛋捞出,鸡蛋表面的水在一段时间后会变干.请你解释这三个现象.

答案:

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D."PTCA involves inserting grafts to divert blood from blocked coronary arteries. "

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