用约翰逊-贝尔曼法则的第二步是找出最长加工时间。()
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几种零件在三台机床上加工,它们的工艺顺序相同。对此种排序问题,可用约翰逊-贝尔曼法则的扩展方法求解。()
A. 对
B. 错
零件按加工时间的大小安排加工顺序,加工时间最短者最先安排。这一安排加工顺序的方法,称为SPT规则。()
A. 对
B. 错
Whenever a guest asks for something, you should promise to provide it right away.
A. 对
B. 错
If you have not caught what the guest said, you may say " what did you say, sir" or simply "Uh?"
A. 对
B. 错