[名词解释] 加气剂

沟深0.6m及以上的电缆沟电力线路支架层间垂直距离为（）。 ["0.15m","0.25m","0.3m","0.35m"] 加工后原料重量等于加工前原料重量与（）的乘积。 ["A、出材率","B、成本率","C、损耗率","D、毛利率"] 外掺剂 鲜酵母发酵，有利于钙和（）的吸收。 ["A、磷","B、钾","C、钠","D、铁"] 眼球中起“暗房”作用的是（）. ["视网膜","葡萄膜","角膜","巩膜","E角膜和巩膜"] 加气剂