髋关节中心性脱位，正确的牵引患肢体位是
A．髋内收位
B．髋外展位
C．足中立位
D．足内旋位
E．足外旋位
参考答案：B,C
根据句意用适当的人称代词填空。
1. This is Linda. _____ is my friend.
2. This is my daughter. _____ is ten
3. —What's this?
—_____ is a pen.
4. This is John. _____is my brother.
5. —Are those your friends?
—Yes, _____ are.
6. —Are _____eleven years old?
—No, I'm ten.
7. —Are you and Tom good friends?
在治疗药物浓度监测样品预处理中，要选择性地浓集待测组分，所采取的方法是
A．去蛋白
B．提取
C．甲基化
D．衍生化
E．灰化
