natural sources of light , , , , , man-made light resources , , , , , , transparent objects , , , , , translucent objects , , , , , opaque objects , , , , , transparent objects may .............................?, allow light to pass through it  , block some of the light and allow some of the light to pass through it , not allow light to pass through , translucent objects may .....................................?, allow light to pass through it, block some of the light and allow some of the light to pass through it, not allow light to pass through, opaque objects may ........................?, allow light to pass through it, block some of the light and allow some of the light to pass through it, not allow light to pass through.

light

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

)
恢复自动保存：？