单项选择题
A.secured to the aftermost fitting on the towing vessel
B.just touching the water
C.underwater
D.as short as possible
单项选择题 To belay a line means to（）.
单项选择题 The shippers to load trucks and heavy cargo，and also to supply all necessary materials for lashing．The expenses will be charged to（）account.
单项选择题 The securing systems for containers were developed to prevent container movement during which ship motion?（）