耐火极限不低于0.5h的门为丙级防火门。建筑物中管道井、电缆井等竖向井道的检查门和高层民用建筑中垃圾道前室的门均应采用丙级防火门。
参考答案：对
We ______ students, we ______ our school and our teachers.[ ]
A. are all, all like
B. are all, like all
C. all are, like all
D. all are, all like
企业对于跨年度且期末能对交易结果做出可靠估计的劳务，应采用完工百分比法确认收入。( )
