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When viewed from above，the best position for the guy in relation to the boom is ______．
A.At a 45° angle
B.At right angles
C.4 feet aft of the heel of the boom
D.Parallel to the boom
参考答案
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prevent the boom from swingingC
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prevent the boom from being lowered
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单选题When must the Master of a vessel log the position of load line marks in relation to the surface of the water in the Official Logbook?（）A
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单选题The preventer guy，as used on a conventional yard and stay rig，（）.A
is rigged at an angle of 70°to 90°from the guy it assistsB
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单选题When viewed from above，the best position for the guy in relation to the boom is（）.A
At a 45° angleB
At right anglesC
4 feet aft of the heel of the boomD
Parallel to the boom
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单选题What does “evel-luffing” accomplish during crane operations（）.A
It prevents the load from swinging when the boom level is adjustedB
Less power is needed when topping the boom with a load on the hookC
It maintains the height of the load above the deckD
All of the above
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单选题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（）.A
Abreast the heelB
At right angles to the boom when viewed from aboveC
Aft of the heelD
Forward of the spiderband
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protect themselves from smokeB
obtain the best available airC
allow the heat and steam to pass overheadD
All of the above
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单选题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（）.A
abreast the heelB
at right angles to the boom when viewed from aboveC
aft of the heelD
forward of the spiderband
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单选题When must the Master or person in charge of a ship log the position of load line marks in relation to the surface of the water in the logbook?（）A
Once a dayB
At the change of every watchC
Only when in fresh or brackish waterD
Prior to getting underway
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