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根据美国屋面工程协会2002—2003年度市场调查,承包商们总体上对2003年前景看好。芝加哥的独立调查公司———盖瑞·西格尔公司负责这次调查。调查表的问题覆盖面很广,包括有关平屋面(商业)和坡屋面(住宅)的销售、设备购买和材料选用等。1平屋面和坡屋面系统销售对比问卷调查显
According to 2002-2003 annual market survey of American Society of Roofing, contractors are generally optimistic about the prospect of 2003. Gary Segal, an independent research firm in Chicago, is in charge of the investigation. Questionnaire surveys cover a wide range of issues, including sales of flat roof (commercial) and sloping roofs (residential), equipment purchase and material selection. 1 flat roof and slope roof system sales comparison questionnaire survey was significant