The expenses for the loading of trucks and heavy cargo and the necessary materials for lashing thereof will be charged to（）account.

A.ships arrive at random
B.cargo-handing time varies greatly
C.ships have to queue to get onto berths
D.ships do not have to wait to get onto berths

A.Adding the KB and the BM
B.Subtracting the KB from the BM
C.Subtracting the GM from the KB
D.Adding the GM and the KB

A.brass
B.copper
C.lead
D.zinc