A boom vang().
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相似题目
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In a married falls rig at the after end of a hatch , a boom is rigged in a fore and aft line through its heel . Stresses on the outboard guy will be least if the guy is made fast at a point().
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A cargo boom is a().
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A band or collar on the top end of a boom to which the topping lift,midships guy,and outboard guys are secured,is called the().
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On a ship’s crane,the load chart relates the allowable load to the combination of the boom length and().
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On your vessel,a wire rope for the cargo gear shows signs of excessive wear and must be replaced. In ordering a new wire for this 10-ton boom,what safety factor should you use?()
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The main advantage and chief characteristic of a Steulchen boom is that it can be().
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A tackle by which the outer end of a boom is raised and lowered is the topping().
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0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the().
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When a cargo boom or crane is rated at varying capacities,there will be a table at the controls which relates safe working load to().
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A band or collar on the top end of a boom which the topping lift, midships guy, and outboard guys are secured, is called the().
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Stress on the topping lift of a swinging boom can be reduced by().
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For a given weight of cargo,the stress on the heel block of a cargo boom().
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The load chart of a crane enables the operator to combine the load radius with boom length to determine the().
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The pivot pin at the base of a sheath-screw boom davit must be().
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What is meant by the term“luffing the boom”of a crane().
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Which part provides for transverse control and positioning of a boom in a conventional yard and stay system().
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The fitting that allows a boom to move freely both vertically and laterally is called the ().
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The lifeboats on your vessel are stowed on cradles on deck and are handled by sheath-screw boom davits. Which of the following statements about launching a boat is TRUE?()
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The boom indicator on a crane will indicate the().
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On a ship crane,the load chart relates the allowable load to the combination of boom length and().
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0ur jumbo boom()out of use for a long time.
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It is hard to tell whether we are going to have b boom in the economy or a ______.
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A classic economic example of zero-sum boom (Paragraph 3) connotes ______.A.economic slack