短语词组短语fiber pull -out test 纤维拔出实验Single fiber pull -out 单纤维拔出bridging fiber pull -out 桥纤维拔出force of fiber pull -out 拨出力single fiber pull -out test 单纤维拔出试验single -fiber pull-out test 单丝拔出试验 返回 fiber pull-out