由于某些原因使桩周在某一长度内产生负摩阻力,这时,在该长度内土层的水平面会产生相对于同一标高处的桩身截面的位移(或位移趋势),其方向是( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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