题型:问答题 看图回答下列各题。1. How many cows are there? .2. How many goats are there? . 3. How many sheep are there? .4. How many lambs are there? .5. How many horses are there? . 查看答案
题型:问答题 假如生产一双皮鞋的社会必要劳动时间是4小时,售出后收入60元.某一生产者率先提高劳动生产效率一倍,即2小时生产一双,他用4小时生产同样的皮鞋售出收入是().A.30元B.60元C.120元D.90元 查看答案