热辐射能量投射到物体表面上时,()占投入辐射的百分比称为投射比。
参考答案:穿透物体的辐射能
下面选项中,不属于HTTP客户端的是______。
A.IE
B.Netscape
C.Mozilla
D.Apache
Remember to ask for a () of quality for these goods; otherwise they will not offer any maintenance.
A. warranty
B. promise
C. certificate
D. receipt