禁止擅自向外界环境排放、倾倒和处置工业废液、废渣、垃圾及其他废弃物。
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作业进度计划应具体体现施工顺序安排的合理性,即满足()等的基本要求。
A. 先地下后地上、先深后浅、先支线后干线、先大件后小件
B. 先地下后地上、先深后浅、先干线后支线、先大件后小件
C. 先地下后地上、先深后浅、先干线后支线、先小件后大件
D. 先地下后地上、先深后浅、先支线后干线、先小件后大件
在车站(货场)、专用线内,专为内部作业使用、不直接贯通道路的平面交叉,均称平过道,由使用单位负责管理。
A. 正确
B. 错误
A butterfly valve consists basically of a disc pivoted across the bore of a ring body having the same radial dimensions as the pipe in which it is fitted.According to the above sentence, which of the following statements is not true?()
A. The diameter of a disc is the same as the outer diameter of the pipe
B. We can infer that the valve is opened or closed by rotating the spindle
C. A butterfly valve comprises a disc and a ring body
D. The profile of the butterfly valve is a ring body