铺贴卷材采用搭接法时,上下层及相邻两幅卷材的搭接缝应___;平行于屋脊的搭接应顺___ ;垂直于屋脊的搭接应顺 ___ 。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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