A. 对 B. 错
A. His sister. B. His father. C. His mother. D. His brother.
A. 紫外线灯管应常用70%醇棉球擦拭 B. 紫外线的杀菌作用只限于直接照射 C. 灯管距地面的距离为1.5~2m D. 4~12室温时,紫外线输出量最高 E. 温度过高或过低均影响紫外线杀菌能力