How much sleep does a person need
(31) the physiological bases of the need for sleep remain
conjectural (猜想), rendering conclusive answers to this question impossible, much
evidence has been gathered on how much sleep people do in fact obtain. Perhaps
the most important conclusion to be (32) from this evidence
is (33) there is great variability among individuals in total
sleep time. For adults, (34) between six and nine hours of
sleep as a nightly average is not unusual, and 7.5 hours probably best expresses
the norm. Such norms, of course, forms inevitably vary with the criteria of
sleep employed. The most (35) and reliable figures on sleep
time, including those cited here, come from studies in sleep laboratories, where
EEG criteria are employed. (36) consistently has been associated with the varying A. is spent B. are spent C. spent D. spending [单选题]一患者下颌为双侧游离缺牙,基牙及牙槽嵴条件均不理想,为了减小支持组织的负担, 设计时以下哪个措施不宜采用
A.减少人工牙数目 B.减小人工牙的颊舌径 C.减小人工牙的近远中径 D.选择牙尖斜度稍小的人工牙 E.缩小基托面积 [单选题]根据《配电安规》,单人操作,是指一人进行的操作。若有可靠的确认和自动记录手段,可实行( )操作。
A.远方单人 B.远方 C.单人 D.程序 [单项选择]建筑物地基施工时可不具备下述()资料。
A. 岩土工程勘察资料 B. 临近建筑物和地下设施类型分布等资料 C. 临近场地远景开发资料 D. 工程设计图纸、设计要求、检验手段等 [单选题] 自控是要素本身所进行的(),是一切控制手段和方法的基础。
A.互相控制 B.自我控制 C.过程控制 D.现场控制 [单选题]停电操作应按照( )的顺序依次操作。
A.断路器→负荷侧隔离开关→电源(母线)侧隔离开关 B.负荷侧隔离开关→电源(母线)侧隔离开关→断路器 C.电源(母线)侧隔离开关→负荷侧隔离开关→断路器 D.以上三种方式均可 [简答题]什么是锁定轨温?
[单选题]搅拌槽溢流后( )。
A.电机温度升高 B.压力降低 C.废水外排 D.水压升高 [单选题]脊髓灰质炎病毒最主要的感染类型是( )
A.隐型感染 B.急性感染 C. 慢性感染 D.潜伏感染 E.慢性感染 [单选题]出租汽车驾驶员文明驾驶行为不包括( )。
A.宁停三分,不抢一秒 B.礼让行人,安全为上 C.礼让三先 D.盛气凌人,赌气开车 [多项选择]关于串的叙述正确的是()。
A. 串是字符的有限序列 B. 空串是空格构成的串 C. 模式匹配是串的一种重要运算 D. 串既可以采用顺序存储,也可以采用链是存储 [单选题]可燃物质在外界热源作用下,温度逐渐升高,当达到()时,即可着火燃烧,称为受热自燃。
A.闪点 B.自燃点 C.燃点 D.熔点 我来回答: 提交
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