By improving the foresupport for heading faces, the safer condition of heading faces will become available, reduces the possibilities of accidents in heading faces.
通过对掘进巷道超前支护的改进，改变了掘进头的安全状况，有效地降低了掘进工作面安全事故的发生。
2
The paper introduces an adjustable compounding light-duty emulsion pump station used for temporary foresupport at the roof-bolt face of underground heading roadway.
本文介绍煤矿井下掘进巷道锚杆支护工作面用于临时超前支护的一种可调配比式轻型乳化液泵站。
3
Photographic content tends to come to the fore due to its strong graphical impact, so other elements should be designed to support that effect and not to compete with it for the viewer's attention.