单项选择题
Sometimes the contract（）that the lump sum freight must be paid in advance and will not be returnable even if the vessel and／or her cargo are lost.
A.provide B.provides C.providing D.be provided
单项选择题 Securing cargo by running timbers from an upper support down to the cargo，either vertically or at an angle，is called（）.
单项选择题 Roll-on／roll-off ships are equipped with（）.
单项选择题 Precautionary measures must be taken to（）safety of the stevedores，cargo and the ship.
