“Z值”是用来评价
A．肺动脉瓣发育情况
B．二尖瓣发育情况
C．主动脉瓣发育情况
D．三尖瓣发育情况
E．左室发育情况
参考答案：D
单句改错。
1. It is a picture in our family.
A B C D
2. Where are the men’ bikes?
3. Can you see Wei Jia and I?
4. Are your cat Chinese or English?
5. We’re in same class. We’re classmates.
6. Where are our English book?
7. She is English girl. She’s twelve.
8. The shoes are in the floor.
9. The rulers are on the teacher desk.
10. The girl look like Lucy.
为了提高模具耐磨性常采用各种（）方法。
A、表面加热
B、表面冷却
C、表面软化
D、表面强化
