影响微囊中药物释放速率的因素（ ）
A．微囊的粒径
B．搅拌
C．囊壁的厚度
D．囊壁的物理化学性质
E．药物的性质
参考答案：A,C,D,E
If she ______ here, she would help you. [ ]
A. was
B. were
C. be
D are
若采用中砂，混凝土坍落度为10～30mm，每立方米混凝土用水量为150kg，则每立方米水泥用量为( )kg/m3。
A．150
B．288
C．268
D．305
