一个数的最高位是亿位,它是______位数.一个六位数,它的最高位是______位.
一个数的最高位是亿位,它是九位数.一个六位数,它的最高位是十万位.
故答案为:九,十万.
让质子()、氘核()和氦核()的混合物以相同的速度垂直电场方向进入同一偏转电场,则它们离开电场时
A.仍是一股离子束
B.会分离为两股离子束
C.会分离为三股粒子束
D.无法确定
用所给动词的正确形式填空。
1. Listen! They _____ (talk) about our new teacher.
2. Mr. Li _____ (take) us to a very beautiful country soon.
3. Betty is good at _____ (draw) very much.
4. He spent a lot of time _____ (do) his homework everyday.
5. If it is fine tomorrow, I _____ (go) with you.
6. He often helps others, and _____ (do) a lot of hard work for the club.
7. He left the room without _____ (say) a word.
8. Elsa put the can in a box and _____ (run) away.