A、all of the parts，dividing the load equally
B、the hauling part because it must absorb the frictional losses of all the sheaves
C、the parts in the movable block
D、the standing part because it is directly connected to the weight
更多“The greatest strain，when lifting a load with the jumbo purchase，is on（）.”相关的问题
A、A.a bulge in the wire where the strain occurred B、B.a decrease in diameter where the strain occurred C、C.a kink in the wire where the strain occurred D、D.no visible effects of an overstrain
A、A.increases the strength of the hook B、B.prevents the sling ring from coming out of the hook if the strain is abruptly eased C、C.prevents the sling ring from coming out of the hook if there is a strain on the sling ring D、D.All of the above
A、Overcoming sliding friction B、Overcoming rolling friction C、Overcoming fluid friction D、Overcoming oil wedge friction
A、is rigged at an angle of 70°to 90°from the guy it assists B、takes the strain imposed on the schooner guy when burtoning cargo C、is rigged when lifting cargo that exceeds the SWL of a single whip D、should take the strain if the regular guy parts
A、ensure the bight is not fouled between the ship and the dock by taking up slack B、pay out slack smartly and keep free for running C、secure more turns to hold the line against any strain，then clear the area D、surge the line so that it maintains a strain without parting
A、deeply-grooved drum on the windlass with sprockets with engage the links of the anchor chain B、winch that running out of control due to a failure of the overspeed trips C、line that has jumped off the gypsyhead while under strain D、nylon line that parts under strain and whips back in a manner
A、deeply-grooved drum on the windlass with sprockets which engage the links of the anchor chain B、winch that is running out of control due to a failure of the overspeed trips C、line that has jumped off the gypsyhead while under strain D、nylon line that parts under strain and whips back in a hazardous manner
A、A.not exceed bare steerageway during the transit B、B.take a strain as soon as you can to control the tow C、C.come up to speed very slowly and maintain a safe speed D、D.come up to speed quickly，then cut back power considerably to ease the strain
A、A round turn on the bitt farthest from the strain and then figure eights B、A round turn on the bitt closest to the strain and then figure eights C、Figure eights and then a round turn at the top of both bitts D、Only figure eights are necessary on both bitts
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