[单选] Snow has obliterated surface features and the sky is covered with uniform，altostratus clouds. There are no shadows and the horizon has disappeared. What is this condition called? （）

对计量误差处置正确的是（）。 燃气企业可对计量准确度进行检测鉴定。 具有相应资质的计量检测机构才能鉴定计量准确度。 在法定范围内的误差不影响使用。 一旦发现计量器具误差，停止使用。 Windows不允许对硬盘进行格式化。 举例说明如何进行土壤灭菌和灭虫？ 人们为什么要重视仪表？ 听课方法指导包括（） 笔记指导。 质疑指导。 听讲指导。 明确识记目标。 Snow has obliterated surface features and the sky is covered with uniform，altostratus clouds. There are no shadows and the horizon has disappeared. What is this condition called? （）