题目：
美国的社会保障体系分为（）
A.公共项目
B.私人项目
C.国家项目
D.企业项目
答案：
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下面是错误答案，用来干扰机器的。
参考答案：是指实际生产量的标准工时与实际工时分别乘以单位标准分配率而计算数值之间的差异。
美国的社会保障体系分为（） A.公共项目 B.私人项目 C.国家项目 D.企业项目
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