渗透泵型片剂释药原理为____，胃内滞留片释药原理为____。

A. came across
B. attacked by
C. ran over
D. dropped off

A. only
B. yet
C. further
D. still

A. advantages
B. losses
C. interests
D. mysteries

A. composing
B. writing
C. imitating
D. inventing