三铰拱的内推力值不仅与顶铰的高度有关,还与拱轴的形状有关。( )
三铰拱的拱高f越大,水平推力也越大。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
图示三铰拱的水平推力H为:()
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