1.What term describes the breaking or chipping of a concrete pavement surface?
1.描述混凝土路面表面破碎或剥落的术语是什么？
2.In brick masonry, when courses alternate between headers and stretchers, what type of bond is being used?
2.在砖砌体中，当每层砖交替采用丁砖（Headers）和顺砖（Stretchers）时，采用的是什么砌筑方式？
3.According to the California Plumbing Code, which material cannot be installed underground for vent pipe applications?
3.根据《加州管道规范》（California Plumbing Code），以下哪种材料不能用于地下通气管（Vent Pipe）安装？
