蓝宝石属(),常见柱状、桶状或板状六边形晶体形态。
A.三斜晶系
B.三方晶系
C.单斜晶系
D.斜方晶系
参考答案:B
根据所给汉语或首字母提示填写单词。
1. We s________the floor just half an hour ago.
2. Jim h________eating junk food. He never goes to the KFC.
3. Could I b________your CD player? Our class is going to have a dancing competition.
4. Don't forget to f________the baby every three hours.
5. Can I use your CD player? M________tis at home.
6. ________(青少年)always enjoys sports and pop music.
7. Thank you for________(邀请)me to your birthday party.
8. Mike takes out the________(垃圾)twice a day.
9. Could you please buy some________(快餐)for me?
10. He takes good________(照顾)of his dad because he is ill.
热力水平管道安装变径时应采用偏心异径管连接,当输送介质为蒸汽时,取( )平;输送介质为热水时,取( )平。
A.管底管底
B.管顶管顶
C.管底管顶
D.管顶管底