依据现行《建筑设计防火规范》的规定，下列哪些管道严禁穿过防火墙？
A.输送煤气的管道
B.输送柴油的管道
C.消防给水管道
D.通风管道
参考答案：B
—What are you doing?
—I'm _____ my bag, but I can't _____ it. [ ]
A. looking for; look for
B. looking for; find
C. finding; look for
D. finding; find
高速钢刀具的符号（）。
A.H
B.S
C.P
D.HSS
