（）are most important for modern logistics. Bar Code, POS, EDI and GPS systems dramatically improve the efficiency and accuracy of logistics activities.

A.Supplychainsystem

B.Informationtechnologies

C.Logisticstechnologies

D.Containerizationtechniques

属于腐蚀性药品的是（）

A．氯化钡

B．松节油

C．硝酸铵

D．苯酚

E．氯化钾