natural stone arch 中文意思是什麼
natural stone arch
解釋
天然石拱-
The results indicate that the natural frequency of vibration of multispan stone arch bridge is closely packed and it has adequate safety allowance
研究結果表明,多跨度石拱橋作為一個整體,其自振頻率較為密集,橋梁具有足夠的安全裕量。
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