结构发生扭曲、变形，影响外观及使用效果。
Structural distortions, deformation, affect the appearance and using effect.
讨论了稳定剂品种、 改性剂品种和发泡剂用量对制品密度、泡孔结构以及外观表面的影响。
The effect of certain types or contents of stabilizers, modifies and blowing agents on extrudate quality density, surface, and cellular structure are described.
预应力混凝土连续箱梁桥的开裂可以说是“多发病”，影响着构件的外观、使用寿命，甚至结构安全。
Cracking is quite common in prestressed concrete continuous box girder bridge, which influences appearance of component, life span of using, and even safety of structure,.
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