当无形成本为非主要成本或非特别关注成本时，可忽略不计。
参考答案：对
After five hours'drive,they reached________they thought was the place they'd been dreaming of.[ ]
A. that
B. where
C. which
D. what
明沟的沟底应设纵向坡度，坡度为（）。
A、0.2%～0.5%
B、0.5%～1%
C、1%～2%
D、2%～3%
