求翻译：对不同几何形状、辐射特性和方向的表面，估计它们之间的热传速率时，常假定：1、所有表面均是灰的或黑的，2、辐射和反射式漫射，3、整个表面参数均匀一致，4、吸收速率等于发射速率并且与投射辐射源的温度无关，5、两辐射表面间的物质既不发射也不吸收辐射。是什么意思？

Different geometry, the direction of the surface radiative properties and the estimated rate of heat transfer between them, often assumed: 1, all surfaces are gray or black, 2, diffuse radiation and reflection, 3, the entire surface uniform parameters, 4, firing rate and absorption rate is equal to

The different geometric shapes, and radiative characteristics and direction of the surface, it is estimated that between them, and often assumed when heat rate: 1, all surfaces are gray or black, and 2, radiation and reflex diffuse, and 3, the entire surface parameters uniform, 4, absorption rate is

To the different geometry shape, the radiation characteristic and the direction surface, estimated when between them hot biography speed, often supposes: 1st, all surfaces are the ash or black, 2, radiation and reflection type diffusion, 3, entire superficial parameter even consistent, and 4, the un

On different geometry shape, and radiation characteristics and direction of surface, estimated they Zhijian of hot pass rate Shi, often assumes that: 1, and all surface are is ash of or black of, 2, and radiation and reflection type diffuse, 3, and entire surface parameter uniform consistent, 4, and

On different geometry shape, and radiation characteristics and direction of surface, estimated they Zhijian of hot pass rate Shi, often assumes that: 1, and all surface are is ash of or black of, 2, and radiation and reflection type diffuse, 3, and entire surface parameter uniform consistent, 4, and