单项选择题
A.视觉照明 B.装饰照明 C.安全照明 D.应急照明
A.0.2~0.3,0.5,0.5,0.25~0.4 B.0.25~0.4,0.5,0.2~0.3,0.5 C.0.5,0.5,0.25~0.4,0.2~0.3 D.0.2~0.3,0.5,0.25~0.4,0.5
A.热效率高 B.传热系数大 C.结构紧凑、占地面积小 D.可以储存热水、对水质没有一定要求