【单选题】甲基橙指示剂的变色范围是 pH ( )。
【判断题】饲料系数是指饲料投喂总量与池鱼收获量之比。()
【单选题】检索钙(calcium)用于食品(food)或者饲料(feed)的添加剂(additive)的英文信息,检索式是:( )
A.
calcium and food or feed and additive
B.
(calcium and food or feed) and additive
C.
calcium and(food or feed)and additive
D.
(calcium and food) or (feed and additive)
【判断题】欧美国家政治运作情况与宋教仁和孙中山的政治主张完全相合。()
【判断题】动物的食物(diet)称为饲料(feed)。
【简答题】feed conversion ration,FCR(饲料转化率)
【单选题】检索磷酸盐( phosphate )用于食品( food)或者饲料(feed)的添加剂(additive)的英文信息,选择下列检索式
A.
food or feed and additive and phosphate
B.
food or (feed and additive and phosphate)
C.
(phosphate and food or feed) and additive
D.
(food or feed) and additive and phosphate