靶向制剂可以分为(),()和()三类。
参考答案:被动靶向;主动靶向;物理化学靶向
—_____ your Chinese teacher very friendly?
—Yes, _____. [ ]
A. Are; he is
B. Is; she is
C. Are; she is
D. Are; they are
F820系统供电方式为()。
A.-48v
B.48v
C.220v
D.都可以