| We all know that the normal human daily
cycle of activity is of some 748 hours’ sleep alternating with some 16,417
hours’ wakefulness and that, broadly speaking, the sleep normally coincides with
the hours of darkness. Our present concern is with how easily and to what extent
this cycle can be modified. The question is no mere academic one. The ease, for example, with which people can change from working in the day to working at night is a question of growing importance in industry where automation calls for round the-clock working of machines. It normally takes from five days to one week for a person to adapt to a reversed routine of sleep and wakeful-ness, sleeping during the day and working at night. Unfortunately, it is often the case in industry that shifts are changed every week: a person may work from 12 midnight to 8 a. m. A. has just been awake from sleep B. can not work night shifts C. should go to sleep at once D. is less productive [单选题]琼脂在水中加热后逐渐溶解,冷却后可( )
A. 散发香味 B. 恢复原样 C. 成海绵状 D. 凝固结块 [多项选择]带电作业记录包括（）。
A. 作业内容； B. 作业方法； C. 作业次数； D. 少停电小时。 [判断题]在开通了免签免密的商户中，只有通过非接的受理方式才可以免签免密。
A.正确 B.错误 [单选题]管钳的规格是指（）的总长度。
A.管钳头开口在1/2处 B.管钳头最大咬合开口时 C.管钳头合口时 D.管钳钳柄 [单选题]外科用药为
A.二妙丸 B.十滴水 C.龟鹿二仙膏 D.明目地黄丸 E.泻毒散 [单选题]下列关于特高频检测数据分析与处理的步骤，①排除外界环境干扰②根据图谱特征判断测量信号是否具备典型放电图谱特征③综合应用超声波局放仪、示波器等仪器进行精确的定位④进一步判断信号源位置，正确的排序是（）。
A.②①④③ B.①②④③ C.②①③④ D.①②③④ [单选题] 虚拟机最早在( )由IBM研究中心研制。 (3分) 查看答案
A.20世纪50年代 B.20世纪60年代 C.20世纪70年代 D.20世纪80年代 [判断题]复合材料桥枕玻璃纤维含量应大于60%。
A.正确 B.错误 [多项选择]下列各项中，属于作业活动的是（）。
A. 企业生产制造产品的活动 B. 流通企业的销售活动 C. 农民的种植活动 D. 医院中的诊治活动 E. 车间组长的协调活动 [多项选择]Behcet病是指（）
A. 13腔溃疡 B. 葡萄膜炎 C. 肝脏损害 D. 皮肤损害 E. 生殖器溃疡 我来回答: 提交
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