单项选择题
A.rigging a back stay B.raising the boom C.increasing the mechanical advantage of the cargo purchase D.taking all slack out of the preventer
Sometimes the contract（）that the lump sum freight must ...
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
Securing cargo by running timbers from an upper support...
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（）.
A.braces B.dunnage C.shores D.toms
Roll-on／roll-off ships are equipped with（）.A.cargo elev...
单项选择题Roll-on／roll-off ships are equipped with（）.
A.cargo elevators B.conveyor belts C.ramps D.derricks and winches for cargo handling
