桥面排水系统如何设计?
为使雨水迅速排除,桥面上一般应设置纵横坡,以防止或减少雨水对铺装层的渗透,还要设置排水设施将雨水迅速排除。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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