下列哪个药物属于脾胃类用药()
A.逍遥丸
B.六味地黄丸
C.六味安消散
D.全天麻胶囊
参考答案:C
用be的适当形式填空。
1. These _____ my apples.
2. Where _____ your chair?
3. They_____ in my bag.
4. _____ they under the chair?
5. I _____ a middle school student.
简述沙纹形状阻力产生的原因?