A.在集裝箱上下部各選取1個(gè)點(diǎn) B.在集裝箱下部選取1個(gè)點(diǎn) C.在集裝箱中部選取1個(gè)點(diǎn) D.在集裝箱上部選取1個(gè)點(diǎn)
A.1% B.0.1% C.0.5% D.2%