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What do we find after the development of the laser in the 1960s? The reason why the laser beam is very strong is that
What do we find after the development of the laser in the 1960s? The reason why the laser beam is very strong is that
admin
2011-01-14
33
问题
What do we find after the development of the laser in the 1960s?
The reason why the laser beam is very strong is that
选项
A、it is artificially illuminated
B、it is made up of a concentrated beam of light
C、it sends out heat in all directions
D、its heat is increased by the heat of the sun
答案
B
解析
细节题。题干的意思是“为什么激光束的能量比较强?”根据原文第二段最后一句可知“能量被集中到一起而变得强大。”故答案为B。
转载请注明原文地址:https://kaotiyun.com/show/Xx5d777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
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公共英语二级笔试
公共英语(PETS)
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