孔隙水压力监测点宜布置在基坑受力、变形较大或有代表性的部位。监测点竖向布置宜在水压力变化影响深度范围内按土层分布情况布设,监测点竖向间距一般为( )m,并不宜少于3个。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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