短語詞組短語Retractive index 折射率retractive stress 收縮應力retractive force 回縮力;收縮力Retractive forces 后牽引Arch Retractive Switch 窄面開關pathological retractive ring 釋義病理性收縮環(huán)heavy retractive pruning 重回縮修剪relay retractive spring 繼電器復原彈簧retractive tube expander 收縮式脹管器 返回 retractive