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  3. 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  21
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。
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