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
更多“Stress on the topping lift of a swinging boom can be reduced by（）.”相关的问题
A、sagging with tensile stress on main deck B、sagging with compressive stress on main deck C、hogging with tensile stress on main deck D、hogging with compressive stress on main deck
A、A.sagging with tensile stress on main deck B、B.sagging with compressive stress on main deck C、C.hogging with tensile stress on main deck D、D.hogging with compressive stress on main deck
A、4，based on the breaking strength B、5，based on the maximum allowable stress C、6，based on the maximum working load D、8，based on the normal working load
A、secured to the aftermost fitting on the towing vessel B、just touching the water C、underwater D、as short as possible
A、A.help keep the deck dry B、B.prevent stress concentrations on the stringer plate C、C.protect against twisting forces exerted on the frame of the vessel D、D.reinforce the side stringers
A、help keep the deck dry B、prevent stress concentrations on the stringer plate C、protect against twisting forces exerted on the frame of the vessel D、reinfo ce th eside stringers
A、GM B、the vertical center of gravity C、the longitudinal center of gravity D、the stress on the hull
A、GM B、the vertical center of gravity C、the longitudinal center of gravity D、the stress on the hull
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