There _____________ a pen and two pencils in the box. [ ]
A. are
B. is
C. has
D. have
答案:B
膝关节创口应
A.一期闭合
B.一期闭合后皮下置橡皮引流条
C.一期闭合关节腔内置橡皮引流条
D.一期闭合后关节腔内置硅胶管闭式引流
E.开放引流
吹喉散1功效与作用