check valve drainage holes的意思|示意
美 / /
英 / /
止回阀排水孔
check valve drainage holes的网络常见释义
逆止式排水孔 ...：水位骤降；逆止式排水孔；防渗边坡；抗滑稳定 [gap=969]Key words：sudden drop of water level；check valve drainage holes；seepage prevention slope；stability against sliding ..