有一工艺性空调房间采用孔板送风,孔口流速为3m/s,空调房间单位面积送风量为42m3/(h·m2),空气在孔板稳压层内的最大流量为6m,则稳压层的净高应为( )。
Goods are carried by several of transport--on road or rail, by sea or air.
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
下列工程中,属于市政公用工程二级建造师执业范围的是( )。
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