题目内容
（请给出正确答案）
A、carbon steel
B、alloy steel
C、cast iron
D、tool carbon steel
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更多“An alloy of iron with more than 2% carbon is called .”相关的问题
Steel is an alloy composed ______of iron and carbon.
A．primarily
B．traditionally
C．carefully
D．partially
Steel is an alloy composed primarily of iron and carbon.
A．traditionally
B．ironically
C．carefully
D．principally
Steel is an alloy composed primarily of iron and carbon.
A. traditionally
B. ironically
C. carefully
D. principally
A.2.11
B.0.77
C.4.3
D.0.0218
A.cast iron
B.forged steel
C.stainless steel
D.aluminum alloy
【C1】
A．times
B．schedules
C．plans
D．timing
Men seem to have always take an interest in meteorites (陨星), but【C1】______the early nineteenth century【C2】______these objects considered worth【C3】______for scientific study.
In the beginning, people believed【C4】______meteorites fell from the heavens, they were other gods themselves or【C5】______from the gods. Thus the more civilized of early men carefully kept the meteorites,【C6】______ them in costly linens and anointing them with oil.【C7】______many instances, the people【C8】______special temples【C9】______the meteorites were【C10】______. Meteorite worship was common long ago in the Mediterranean area, and in Africa, India, Japan, and Mexico; 【C11】______worship still persists in some regions.
Although many people held meteorites in reverence, 【C12】______if they were seen to fall, other practicalminded individuals made good use of the【C13】______and easily-worked alloy【C14】______by nature in the nickel-iron meteorites. They frequently used this metal【C15】______tools, and often pots and other utensils. Throughout history, meteoritic iron【C16】______manufacture of special swords daggers, and knives for members of royalty. Attila and other early conquerors of Europe boasted.【C17】______ "swords from heaven".【C18】______the end of the nineteenth century, several swords were made【C19】______a Japanese iron meteorite【C20】______the command of the Japanese court.
【C1】
A．not until
B．until
C．since then
D．since
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
Men seem to have always taken an interest in meteorites, but not until the early nineteenth century were these objects considered worth preserving for scientific study.
In the beginning, people believed that because meteorites fell from the heavens, they were either gods themselves or messages from the gods. Thus the more civilized of early men carefully kept the meteorites, drapping them in costly linens and anointing them with oil. In many instances, the people built special temples in which the meteorites were to be worshiped. Meteorite worship was common long in the Mediterranean area, and in Africa, India, Japan, and Mexico: such worship still persists in some regions.
Although many people held meteorites in reverence paritcularly if they were seen to fall, other practical minded individuals made good use of the durable and easily worked alloy provided by nature in the nickel-iron meteorites. They frequently used of this metal to make tools, and often pots and other utensils. Throughout history, meteoritic iron has been used in the manufacture of special swords, daggers, and knives for members of royalty. Attila and other early conquerors of Europe. boasted of "swords form. heaven". As late as the end of nineteenth century, several swords were made from a Japanese iron meteorite at the command of a member of the Japanese court.
In the nineteenth century men began to ______.
A．investigate practical uses for meteoritic iron
B．study meteorites scientifically
C．take more than a casual interest in meteorites
D．preserve meteorites
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