侧放，自动关闭，不带轮缘。

Side mount, self closing, without flange.

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大堤开裂的主要原因为背河侧放淤、淤背施工过快、湿化变形、排水不畅、堤顶堆载、车辆作用等。

The main factors are reinforcing dike with silt, construction in high speed, soak deformation, poor drainage, stacking load at the tip of dike, impact of vehicle and so on.

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如果病人是有知觉的，让病人躺下来，头部和肩部应该稍高一点并支撑起来。将头部侧放以使口水从嘴里面流出来。

If conscious, lay the casualty down with head and shoulders slightly raised and supported. Position head on the side to allow saliva to drain from the mouth.

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