喷油器的燃油泄漏量在1min内应少于（）滴，否则应予以更换。
A.4滴
B.2滴
C.1滴
D.半滴
参考答案：C
控释制剂有（）、透皮、注射等多种给药途径。
The user must interact with the ______ in order to accomplish task.
A．printer B．memory C．CPU D．operating system
