许弯曲单位应力 allowable flexural stress: 容许弯曲应力allowable bearing unit stress: 容许单位支承应力allowable bond unit stress: 容许单位结合应力allowable buckling unit stress: 容许单位扭曲应力allowable compressive unit stress: 容许单位压应力下载手机词典可随时随地查词查翻译