单选题
发布日期:2021-03-22
the beveled edges of the intake valves provide for serf-centering during seating
intake valves utilize stellite-coated valve seat inserts which reduce wear
the volume of air passing through intake valves is less than the volume of air passing through exhaust valves
intake valves are less affected to the corrosive action of exhaust gases
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背景资料我国西南地区的某河流上,根据河流规划拟建一水电站枢纽工程,主坝二级土石坝。工程以发电为主,同时兼有防洪、灌溉等功能。该流域大部分为山地,山脉、盆地相互交错于其间,地形变化剧烈。坝址位置河谷狭窄,两岸山坡陡峻,为坚硬的玄武岩。从筑坝材料上看坝址上下游2km内有可供筑坝的土料190万m3作为防渗体之用,又有1250万m3的砂砾料作坝壳,作心墙和斜墙坝都是可行的。由于本地区黏性土料自然含水量较高,不宜大量采用黏性土料,以薄心墙、薄斜墙较为有利,又因坝基条件复杂、处理工程量大、工期长,故设计方案为斜墙坝。经过专家论证,由于涵管泄流能力有限,因此采用涵管无法满足施工导流要求。施工单位拟定的施工导流方案为:采用分段围堰法导流,分两段两期进行土石坝施工。在土石坝开工前,施工单位进行了碾压试验等土石坝筑坝材料施工试验项目。问题: 本工程碾压试验的目的是什么?除碾压试验外,施工单位还应进行哪些施工试验?
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