题目内容：
产品的装配总是从( )开始，从零件到部件，从部件到整机。
A.装配基准
B.装配单元
C.从下到上
D.从外到内
参考答案：
选择题：产品的装配总是从( )开始,从零件到部件,从部件到整机。
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- 题目类型：选择题
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