When cargo aboard a jack-up in transit becomes adrift，the tow vessel should be asked to （）.

A.all decks intended for the stowage of vehicles are，in so far as is practicable，free from oil and grease
B.the ship has on board an adequate supply of cargo securing gear，which is maintained in sound working condition
C.vehicles are in apparent good order and condition suitable for sea transport，particularly with regards to securing
D.All of the above

A.weld pad eyes on deck in proper position to secure the cargo
B.strengthen the main deck by placing pillars underneath it in the tween-decks
C.distribute the weight of the cargo by placing fore-and-aft planks on the main deck
D.package the cargo in wooden crates so it will not damage the deck

A.butterfly valve
B.spectacle valve
C.check valve
D.globe valve