海船船员考试
单选题What material may be substituted for zinc when making a poured metal socket ending to a wire rope（）.A LeadB BabbittC SolderD Nothing
题目
Lead
Babbitt
Solder
Nothing
相似问题和答案
第1题：
If you pour oil on water, it_________float.
A. shall
B. will
C. can
D. may
第2题：
Despite their limitation, however, these systems may eliminateor significantly reducethe costs that companies face when using privately owned electronic networks, making it difficult for smaller companies to afford EDI.()
此题为判断题(对，错)。
第3题：
A. breathless
B. feel flushed
C. feel itchy
D. have chills
第4题：
A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when ______.
A.wearing a life jacket
B.wearing a safety harness secured to the stage
C.wearing both a life jacket and a safety harness secured to the stage
D.the vessel is not making way
第5题：
According to the passage, when you get a wrong number in making a long-distance call, you should______.
A. check your number and call again
B. tell the operator what has happened
C. Ask the operator to put you through
D. Ask the operator what has happened
39．答案为B 第二段...call the operator and explain what happened可知拨错号码后可向接线员解释，以免收费。
第6题：
Despite their limitations, however, these systems may eliminate ― or significantly reduce ― the costs that companies face when using privately owned electronic networks, making it easier for smaller companies to afford EDI.
第7题：
Passage Three
In an age when waste today means a lack tomorrow, making use of every available resource becomes more and more important. As coal is being used in greater and greater amounts to produce electricity, larger amounts of ash, by-product of coal, are produced. When coal is burned
in a boiler, two kinds of ash by-product are produced, a heavy bottom ash and a fine-as-powder fly ash that is filtered and captured by precipitators. About 10 to 15 percent of the coal by-product is bottom ash which is used like sand on icy city streets and highways and also on highways as paving material. It is the fly ash, however, that is receiving the greater amount of attention. Fly ash may be used as an additive to concrete in the construction of dams, bricks, and roads, and can replace up to 20 percent of the cement used in concrete. As a by-product of burned coal, fly ash requires no additional expenditure of energy to be produced, while cement production requires great amounts of energy.
In addition to using fly ash as a concrete additive, the technology is available to extract the main mineral components-aluminum, silicon, and magnetic. Today, extracting these components is a very expensive process, but the time may come when it is cheaper to extract these products from ash than to mine new supplies.
41. What can be used as a material to pave roads?
A. The coal by-product.
B. Additive.
C. Fine-as-powder fly ash.
D. Both B and C.
答案为 A。根据题干找到第一段第三、四句，About 10 to 15 percent of the coal by-product is bottom ash which is used like sand on icy city streets and highways and also on highways as paving material 符合题意。
第8题：
Which of the following types of cost are relevant to making financial decisions:
A . sunk cost
B . opportunity cost
C . material cost
D . A and C only
E . B and C only
第9题：
The material used extensively as electrolytic protection around bronze propellers is ______.
A.Brass
B.Copper
C.Lead
D.Zinc
第10题：
Coast Guard approved buoyant work vests ______．
A.may be substituted for 10 percent of the required life preservers
B.should be stowed adjacent to lifeboats and emergency stations
C.may be used by boat crews and line handlers during lifeboat drills
D.should be used when carrying out duties near a weather deck's edge