Medics are often expected to work night shifts, weekends and longer hours, for which they receive extra payments.
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643 0 3 SHIFT DLY IN+D ; SIGMA = 3，推荐阅读夫子获取更多信息
for Big Blue to bring their own version. Still, IBM had their own legacy to，推荐阅读51吃瓜获取更多信息