差错登记制度是为了
A．SDA．B．BP．C．JP．D．USP．E．WHO．
参考答案：A
何种皮片移植成活后收缩最少（）。
A.刃厚皮片
B.薄断层皮片
C.一般中厚皮片
D.厚中厚皮片
E.全厚皮片
History is( ) a subject that only lets us know something in history; it also tells us a lot of truth.
A．less than B．more thanC．no more than D．not more than
