多雨潮湿地区的高速公路沥青面层空隙率较大,有严重渗水可能,或铺筑基层不能及时铺筑沥青面层而需通行车辆时,宜在喷洒()后铺筑下封层。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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