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What do we find after the development of the laser in the 1960s? [br] The reason
What do we find after the development of the laser in the 1960s? [br] The reason
游客
2025-07-27
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问题
What do we find after the development of the laser in the 1960s? [br] 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://tihaiku.com/zcyy/4178472.html
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