问题描述：
[单选]
操作工密度描述准确的是？a． min mt per operator on 1 board : min 1，5 meter for routing & min 1．5 meter per taping．b． min mt per operator on 1 board : min 1，5 meter for routing & min 2 meter per taping．c． min mt per operator on 1 board : min 1，5 meter for routing & min 1 meter per taping．d． min mt per operator on 1 board : min 1 meter for routing & min 1 meter per taping．
A．A
B．B
C．C
D．D
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答案解析：无
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