具有物权凭证作用的单据是( )。

A．sanitary certificate；report of findings；replacement certificate
B．replacement certificate；report of findings；sanitary certificate
C．report of findings；sanitary certificate；replacement certificate
D．sanitary certificate；replacement certificate；report of findings

A．credit；dry weight；customs declaration form
B．draft；credit；customs declaration form
C．customs declaration form,；draft；credit
D．credit；customs declaration form；draft