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肛周瘘(名词解释)

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辐射电磁波的发射和传递不需要介质。()

舍内空气流动的速度和方向，主要决定于畜舍结构的严密程度和畜舍的通风。()

As is known to all, there are many forms of energy, ______is solar energy.

A. one of that
B. one of whom
C. which of one
D. one of which

一个善于吸收辐射能的物体，亦必是一个善于发射的物体。()