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 cargo boom is a（）.
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（）.
On a ship’s crane，the load chart relates the allowable load to the combination of the boom length and（）.
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?（）
The main advantage and chief characteristic of a Steulchen boom is that it can be（）.
A tackle by which the outer end of a boom is raised and lowered is the topping（）.
0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.
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（）.
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（）.
Stress on the topping lift of a swinging boom can be reduced by（）.
For a given weight of cargo，the stress on the heel block of a cargo boom（）.
The load chart of a crane enables the operator to combine the load radius with boom length to determine the（）.
The pivot pin at the base of a sheath-screw boom davit must be（）.
What is meant by the term“luffing the boom”of a crane（）．
Which part provides for transverse control and positioning of a boom in a conventional yard and stay system（）.
The fitting that allows a boom to move freely both vertically and laterally is called the （）.
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?（）
The boom indicator on a crane will indicate the（）.
On a ship crane，the load chart relates the allowable load to the combination of boom length and（）.
0ur jumbo boom（）out of use for a long time.
It is hard to tell whether we are going to have b boom in the economy or a ______.
A classic economic example of zero-sum boom （Paragraph 3) connotes ______.A．economic slack
