工业建筑按生产类别及储存物品类别的火灾危险性特征，分为甲、乙、丙、丁、戊五种类别。
参考答案：对
改错。
( ) 1. Winter, spring, summer and fall are months. ______________
A B C D
( ) 2. How a hot sunny day! ______________
( ) 3. What do you like doing in winter? ______________
( ) 4. I'm going to put off my hat now. ______________
( ) 5. I like to skate on the snow. ______________
洁净室地面安装过程中，在水泥地铺板材时，表面平整度偏差为( )。
A．1/1000 B．2/1000 C．3/1000 D．4/1000
