问题
单项选择题
Packaging performs 2 basics functions---marketing and （）.
A.Convey product knowledge
B.Promotion
C.Advertising
D.Logistics
答案
参考答案：D
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Packaging performs 2 basics functions---marketing and （）.
A.Convey product knowledge
B.Promotion
C.Advertising
D.Logistics
参考答案：D
2B(g)＋C(g)；②A(g)