物体的透过率表明了物体通过辐射能的本领，能全部透过辐射能的物_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题判断题

物体的透过率表明了物体通过辐射能的本领，能全部透过辐射能的物体，称为透热体。

答案

参考答案：对

选择题

Mr Green didn’t know ______ last night.

A．when does his son come back

B．when his son comes back

C．when his son come home

D．when his son came home

判断题

清煤人员作业位置，面朝采煤机前进的方向。