影响超声造影回声强度的因素是
A．微气泡大小
B．血液酸碱度
C．红细胞浓度
D．微颗粒大小
E．发射超声功率
参考答案：A,E
Read and choose.(根据情景选择适当的句子)
1. 当你想笃一张邀请卡时，应说：____[ ]
A. Let's invite your parents.
B. Let's write an invitation.
2. 当你想给别人一张小提琴曲的唱片时，应说：____[ ]
A. I'll give you a CD with violin music.
B. I'll give you a book about America.
3. 当听说你生病了，你的朋友应说：____[ ]
A. I'm sorry to hear that.
B. I'm happy to hear that.
4. 当你的朋友要去旅游时，你会说：____[ ]
A. Have a good trip!
B. Write soon!
在以双倍余额递减法计提固定资产折旧时，不需要考虑固定资产的残值。( )
