成分过冷
参考答案：合金溶液在凝固时，理论凝固温度不变，过冷度完全取决于溶质成分的分布，这样的过冷称为成分过冷。
根据答语写出问句。
1. —__________________________?
—My books are on the desk.
2. —__________________________?
—His baseball is under the chair.
3. —__________________________?
—Yes, it is. My hat is on the bed.
4. —__________________________?
—No, they aren't. Her pencils are not in
the bookcase. They are in her desk.
5. —__________________________?
—Their plants are on the table.
股骨干上段骨折患者，其牵引治疗时的最好体位是
A．外展位牵引
B．髋关节前屈位牵引
C．水平牵引
D．内收位牵引
E．髋关节屈曲，大腿外旋外展位牵引
