某钢筋混凝土预制摩擦型方桩,边长45cm,桩长10m,桩端阻力特征值qpa=3000kPa,桩侧阻力特征值qsia=100kPa,单桩竖向承载力特征值为()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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