scum hole是什么意思

用法例句

Aiming at high design requirement and great technical difficulties,construction methods such as blasting control,excavating and mucking in the tunnel and grout injection in the holes with anchor have been improved on so as to advance construction efficiency,quicken construction schedule and increase economical benefits finally.

针对此工程设计要求高、技术难度大等特点,对爆破控制、洞室开挖出渣、锚杆注浆等施工方法进行了改进,提高了施工工效,加快了施工进度,最终提高了经济效益。

Introduction is given to experiment on changing reaction zone lining into Mg Cr Al bricks in volatilization kiln for treating zinc leaching residue and practice for achieving domestic leads in same industry after continuous operation for 244 days by using this kind of brick lined volatilization kiln.

介绍了挥发窑处理锌浸出渣时 ,反应带改用镁铬铝砖的试验及使用该砖种挥发窑连续运行了 2 44 d达到国内同行业领先水平的实践情