建筑施工露天作业、高处作业、交叉作业多的特点，导致施工现场不安全因素多。
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A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases?（）.
A. In the lower level of the pumproom
B. In the middle level of the pumproom
C. In the upper lever of the pumproom
D. On the deck outside the pumproom
会计要素价值计量的方法有（）
A. 历史成本法
B. 重置成本法
C. 可变现净值法
D. 现值法
E. 公允价值法
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