My mum does _____ housework every day. [ ]
A. many
B. much
C. any
D. a lots of
答案:B
设备购置费的组成为( )。
A.设备原价+采购与保管费
B.设备原价+运费+装卸费
C.设备原价+运费+采购与保管费
D.设备原价+运杂费
简述煤气着火事故的处理方法。