黄连素片包薄膜衣的主要目的是______。
A．防止氧化变质B．防止胃酸分解C．控制定位释放D．避免刺激胃粘膜E．掩盖苦味
参考答案：E
--- Were you at home at 9:00 pm yesterday?
--- Yes, I for a call from Paris at that time.
A．was waiting
B．am waiting
C．will wait
D．Waited
在胶体化学中，把能使溶剂表面张力下降的性质称为（）。
