多项选择题

实行个别企业的公私合营。即（）。
A、国家入股
B、共同管理
C、四马分肥
D、公司制

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作业成本管理涉及的仅仅是生产成本而不包括期间费用。
正确
错误

答案：正确

单项选择题

XYZ uses standard costing. It makes an assembly for which the following standard data are available: Standard labour hours per assembly is 24. Standard labour cost per hour is $8. During a period 850 assemblies were made, there was Nil rate variance and an adverse efficiency variance of 4,400. How many actual labour hours were worked?

A．19,850
B．20,400
C．20,950
D．35,200