A bird feathers and wings.[ ]
A. have
B. has
C. had
答案：B
下列宜制成胶囊剂的是
A．维生素E
B．药物的稀乙醇溶液
C．甲醛
D．硫酸锌
E．O/W乳剂
水轮机蜗壳有何作用？
