上腹部手术要求硬膜外阻滞平面上界达到（）
A．T2
B．T4
C．T6
D．T10
E．T12
参考答案：B
解析：
本题考查麻醉基础知识。
读一读，判断正误。
( )1. The cat is in the box.
( )2. The cat is under the table.
( )3. The T-shirt is big.
( )4. The boy is short.
( )5. I have twenty books.
精苯工序对初馏份和混合份有什么要求？
The cat is in the box. 
The cat is under the table. 
The T-shirt is big.
The boy is short.
I have twenty books.