一般情况下,未设置自动灭火系统的丙类二级耐火等级单层厂房,每个防火分区的最大允许建筑面积为()。
A、6000m2
B、8000m2
C、4000m2
D、12000m2
参考答案:B
Jeff can't come to the party, because he'll _______ help his mom. [ ]
A. must
B. has to
C. have to
D. need to
施工图预算的作用及其编制的内容和依据是什么?