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问题 填空题

计算：a4?a2=　 ．

答案

a6

根据同底数幂的乘法法则，同底数幂相乘，底数不变，指数相加，即am?an=am+n计算即可．

解答：解：a4?a6=a4+2=a6．

故答案为：a6．

填空题

根据句意和首字母或汉语提示，将单词的正确形式写在相应的横线上。

1. You must stop s____________, nicotine (尼古丁) is bad for your health.

2. The girl s____________ a lot of time collecting stamps last year.

3. We were glad to celebrate our motherland, China's s__________ birthday on October 1st, 2009.

4. I like ____________ (土豆) a lot, and my mother usually cooks it in different ways.

5. Which are __________ (重的), elephants or sheep?

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单项选择题

即有文字材料又有图纸的案卷，（）。

A、图纸排前，文字材料排后

B、文字材料排前，图纸排后

C、任意排前均可

D、文字说明跟随图纸适当排列
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