鼻用混悬型软膏
A．油脂性基质B．水溶性基质C．栓剂基质D．乳化剂E．气雾剂的抛射剂
参考答案：C
–Your coat look nice. What is it ____? –Cotton.
A. made of B. made in C. made from
简述留置权的概念及其成立要件。
