先计算菜点各种原料成本，然后各项成本逐一相加的成本计算方法适合于（）生产的成本计算
A、单件
B、面点
C、烹调
D、批量
参考答案：A
陆地地形的五种基本类型是______、______、______、______和______．
-What are on show in the museum?
-Some photos _____by the children of Yushu, Qinghai.
A．have been taken
B．were taken
C．are taken
D．taken
