【客户销货明细表】中成本依据有哪些？（）
A.标准成本
B.实际成本
C.移动平均成本
D.历史成本
参考答案：A, B
The manager along with his workers _______ day and night to complete the project.
A．have worked
B．work
C．is working
D．are working
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