把l8分解质因数是l8=2×9.______.(判断对错)
18=2×3×3,
故答案为:×.
单词拼写.
1. The Great wall is one of the seven________(奇迹) of the world.
2. She________(目标) to achieve her goal after two years.
3. The trip to Paris will be an________(理想的) opportunity to practice my French.
4. She always insists that her writing paper is of good________(质量).
5. As far as I know, he will________(退休) next month.
6. During the school holidays the children enjoyed their________(自由).
7. The supermarket opened last year sells a________(种类) of goods.
8. I have made a________(记号) on the map where we should go.
9. When four banks failed in one day, there was a________(惊慌) among businessmen.
10. That________(解释) for the delay of the train.
当把H2O(l)和D2O(l)混合后,会自发发生下面反应:H2O(l)+D2O(l)=2HOD(l),O-H键和O-D键的键焓几乎没有区别,那么这个反应的主要驱动力是()。