单层管廊架主要构件包括()。
A.水平拉筋
B.横梁
C.剪刀撑
D.管廊柱子
参考答案:B, C, D
解析:
单层管廊架主要构件包括管廊柱子、横梁、管线和剪刀撑。
Mr Black works very long hours. He is tired, _____ he is happy. [ ]
A. and
B. with
C. but
D.so
天然气