发布时间:2025-01-19 19:22:52
水平投影面积——垂直于水平面的射线(例如正午的太阳光)将物体投影到水平面的投影。
垂直投影面积——垂直于垂面(比如墙体平面)的射线(例如远处的探照灯)将物体投影到垂直面的投影面积。
川大附近有哪些一本二本院校要近小于一个小时的车程不一定要在同一个省
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