第1题:
With a given load on the cargo hook,the thrust on a cargo boom ______.
A.increases as the angle to the horizontal increases
B.increases as the angle to the horizontal decreases
C.is greatest at an angle of 45° and decreases as the boom is raised or lowered
D.is least at an angle of 45° and increases as the boom is raised or lowered
第2题:
The boom indicator on a crane will indicate the ______.
A.Length of the boom
B.Angle of the boom
C.Lifting capacity of the boom
D.Direction of the boom
第3题:
A boom vang ______.
A.holds the boom down and flattens the main sail
B.draws the head of the sail to windward
C.tautens the standing rigging
D.douses the gaff topsail
第4题:
ASP(音频控制面板)的正常位置是()
第5题:
现代交通运输业的高度发达为现代旅游业的迅速发展提供了()
第6题:
世界现代旅游业迅速发展的原因是什么?
第7题:
第8题:
being raised too high
swinging at sea
overloading when not in use
being lowered too low
第9题:
holds the boom down and flattens the main sail
draws the head of the sail to windward
tautens the standing rigging
douses the gaff topsail
第10题:
increases as the boom's angle to the horizontal increases
is at a maximum when the boom is at a 45° angle to the horizontal
increases as the boom's angle to the horizontal decreases
decreases as the boom's angle to the horizontal decreases
第11题:
第12题:
length of the boom
angle of the boom
lifting capacity of the boom
direction of the boom
第13题:
The boom stops on a pedestal crane prevent the boom from ______.
A.being raised too high
B.swinging at sea
C.overloading when not in use
D.being lowered too low
第14题:
What is meant by the term“luffing the boom”of a crane ________.
A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above
第15题:
日本旅游业为什么能够迅速发展?
第16题:
简析韩国旅游业迅速发展的原因。
第17题:
试从旅游需求和旅游供给的角度,分析二战后世界旅游业迅速发展的原因。
第18题:
increases as the cargo closes the head while hoisting
increases if the cargo runner is doubled up
decreases as the boom is topped to a greater angle
is determined by the thrust stresses on the boom
第19题:
Lowering the boom
Raising the boom
Spotting the boom over the deck
Swinging the boom athwartships
第20题:
第21题:
increases as the angle to the horizontal increases
increases as the angle to the horizontal decreases
is greatest at an angle of 45° and decreases as the boom is raised or lowered
is least at an angle of 45° and increases as the boom is raised or lowered
第22题:
vertical position
horizontal position
boom stop angle
minimum radius angle
第23题:
prevent the boom from being raised too high
prevent the boom from swinging
support the boom when not in use
prevent the boom from being lowered