下列哪些装配式构件应该计算安装、制作或堆放损耗()
A.地沟盖板
B.屋架
C.桁架
D.空心板
参考答案：A, D
New York City surpassed the other Atlantic seaports in partly because it developed the best transportation links with the interior of the country.
A．part
B．partial
C．partner
D．parting
安全/质量意识
