可避免肝脏首过作用的片剂是（）
A.泡腾片
B.分散片
C.舌下片
D.普通片
E.溶液片
参考答案：C
请在如下左图中画出经过透镜折射后的光线。
In the manufacture of wire rope，if the wires are shaped to conform to the curvature of the finished rope before they are laid up，the rope is called（）.
A.composite
B.left-lay
C.improved
D.preformed
