问答题
【参考答案】
一个解决的办法似乎是每次换班持续的时间长一些,可以一个月甚至三个月倒一次班。
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我们都清楚正常人每天的活动周期是大约 7~8小时的睡眠和16~17小时的清醒相互交替,我们也知道,一般来说,睡眠常在夜间进行。
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单项选择题
A.To sell and to inform.B.To increase prices and competition.C.To change the means of selling and buying.D.To take away chances of choosing from customers.
A.To sell and to inform.
B.To increase prices and competition.
C.To change the means of selling and buying.
D.To take away chances of choosing from customers.
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