A trade custom has been proved to the effect that in trade between Sarawak and Singapore mate’s receipts（）universally adopted as documents of title as in same way as bills of lading.

A.deadweight cargo tonnage aboard
B.displacement tonnage of vessel
C.gross tonnage of vessel
D.net tonnage of vessel

A.to increase the arrival／start of operations interval
B.to increase the finishing of operations／leaving berth interval
C.to decrease both the arrival／start of operations interval and the finishing of operations／leaving berth interval
D.to decrease working shifts