top surface of the beam
top surface of the beam
[建筑英汉词典]
top surface of the beam梁顶面
是什么意思，top surface of the beam的解释，top surface of the beam的翻译
top surface of the beam
[建筑英汉词典]
top surface of the beam是什么意思，top surface of the beam的解释，top surface of the beam的翻译