text: # -*- coding: utf-8 -*-
  
  # Define here the models for your scraped items
  #
  # See documentation in:
  # http://doc.scrapy.org/en/latest/topics/items.html
  
  import scrapy
  
  #from scrapy import Field, Item
  #class Test0Item(Item):
  #下面这样就不用写成chinese_name = scrapy.Field()，直接写成chinese_name = Field()
  
  class Test0Item(scrapy.Item):
      # define the fields for your item here like:
  
  #所有cas的url地址尾部,这个写的早，其实后面用不到
  #    cas_url_list_big = scrapy.Field()  
  #    cas_url_list_small = scrapy.Field()  
  
  
          
          
  #    中文名称
      chinese_name = scrapy.Field()
  #    中文别名
      chinese_alias = scrapy.Field()
  #    英文名称
      english_name = scrapy.Field()
  #    英文别名
      english_alias = scrapy.Field()
  #    cas号
      cas_number = scrapy.Field()
  #    EINECS号
      einecs_number = scrapy.Field()
  #    分子式
      molecular_formula = scrapy.Field()
  #    分子量
      relative_molecular_mass = scrapy.Field()    
  #    InChI
      inchi = scrapy.Field()
  
  
  
  
  
  #    分子结构,分子结构是一张图片，刚开始只能获得名字和链接，再次请求才得到图片
  #    molecular_structure_image_in_base64 = scrapy.Field()
  #    分子结构链接
      molecular_structure_url = scrapy.Field()
  #    分子结构名字
      molecular_structure_name = scrapy.Field()
  
  
  
  
  #    密度
      density = scrapy.Field()
  #    熔点
      melting_point = scrapy.Field()
  #    沸点
      boiling_point = scrapy.Field()
  #    闪点
      flashing_point = scrapy.Field()
  #    水溶性
      water_solubility = scrapy.Field()
  #    蒸汽压
      vapour_pressure = scrapy.Field()
  #    物化性质
      physical_and_chemical_properties = scrapy.Field()
  #    产品用途
      product_usage = scrapy.Field()
  #    危险性标志
      hazard_symbols = scrapy.Field()    
  #    风险术语
      risk_term = scrapy.Field()
  #    安全术语
      security_term = scrapy.Field()    
  #    上游原料
      upstream_raw_materials = scrapy.Field()
  #    下游产品
      downstream_products = scrapy.Field()
    
  
  