单项选择题
A.together with B.on top of C.underneath D.away from
Stress on the topping lift of a swinging boom can be re...
单项选择题Stress on the topping lift of a swinging boom can be reduced by（）.
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
