Halon gas will decompose and may form very hazardous toxic fumes when discharged（）.

A.directly on flames

B.at room temperature

C.in an extremely cold climate

D.None of the above

在影像总模糊的因素中，最大模糊是

A．几何模糊
B．移动模糊
C．颗粒性模糊
D．冲洗加工模糊
E．屏-片组合模糊