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例如有种情况,自动化工厂要求持续24小时的机器运转,因此日夜颠倒上班成了一个越来越重要的问题。
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单项选择题
A.Doctor and patient.B.Teacher and student.C.Husband and wife.D.Shopkeeper and customer.
A.Doctor and patient.
B.Teacher and student.
C.Husband and wife.
D.Shopkeeper and customer.
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