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小题1: If you use it often and in the right ways, you will become a more skilled thinker and your ability to focus will increase. But if you never use your brain, or abuse it with harmful chemicals, your ability to think and learn will decrease. Here are some simple ways that may help you. 小题2: Don’t you feel drained(劳累) after a couple of hours of watching TV? Your eyes are sore and tired of being focused on the light box for so long. When you feel like relaxing, try reading a book instead. If you’re too tired, listen to some music. When you’re with your friends or family, leave the tube off and have a conversation. All of these things use your mind more than television and allow you to relax. Exercise. I used to think that I’d learn more by not exercising and using the time to read a book instead. 小题3: It improves productivity(生产力) during the time afterwards. Using your body clears your head and creates a wave of energy. Afterwards, you can concentrate(专注) more easily. Read challenging books. If you want to improve your thinking and writing ability, you should read books that make you focus. Reading a classic novel can change your view of the world and will make you think in more elegant English. 小题4: Re-read it when necessary, and you’ll soon grow accustomed(习惯) to the author’s style. Early to bed, early to rise. 小题5: You’ll be the most energetic if you go to bed early and don’t sleep for more than 8 hours. In my experience the early morning hours are the most productive. If you have the opportunity, take a 10-20 minute nap(小憩) when you are hit with a wave of drowsiness(睡意). A.Take a time to reflect. B.Reduce television watching. C.Spending some time alone will be helpful. D.Your brain needs exercise just like a muscle (肌肉). E. Don’t be afraid to look up a word if you don’t know it. F. Nothing makes it harder to concentrate than sleep loss. G. But I realized that time spent exercising always leads to greater learning.
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【单选题】【Test-9-1-10】具有n个关键字的m阶B-树有( )个失败结点。
A.
n+1
B.
n-1
C.
n×m
D.
不确定
【单选题】下列关于失眠的描述,哪项是错误的
A.
主要表现为入睡困难、睡眠维持困难或早醒
B.
严重的生活事件可引发失眠
C.
有的失眠患者即使睡眠时间充足也会报告睡眠感缺失,认为自己没怎么睡
D.
急性失眠的病人即使脱离或适应了特定的应激源后,失眠仍无法缓解
E.
治疗失眠的药物首选短效类镇静催眠药,如咪哒唑仑
【单选题】下列各项关于社会风险的描述错误的是( )。
A.
风险即不可预见的事件和该事件所带来的经济损失
B.
在人们的基本生活中不可避免地会发生很多依靠个人能力无法克服的风险,这种风险被称为非系统风险
C.
社会风险即概率最大的,人人都可能遇到的风险
D.
社会风险包括年老、患病、失业、职业伤害、生育和家庭困难六类
【单选题】关于产后抑郁症的描述,下列错误的是
A.
孕期发生不良生活事件越多,患病的可能性越大
B.
可表现出自责、自罪、自我伤害的行为
C.
有家族抑郁症病史的产妇,发病风险高
D.
产后抑郁症可由多方面造成
E.
是一组精神病性的抑郁综合征
【单选题】关于产后抑郁症的描述,下列错误的是
A.
孕期发生不良生活事件越多,患病的可能性越大
B.
可表现出自责、自罪、自我伤害的行为
C.
有家族抑郁症病史的产妇,发病风险高
D.
产后抑郁症可由多方面因素造成
E.
是一组精神病性的抑郁综合征
【单选题】抽样误差是( )。 A.在调查过程中由于观察、测量等差错所引起的误差 B.在调查中违反随机原则所出现的误差 C.随机抽样而产生的代表性误差 D.人为原因造成的误差
A.
B.
C.
D.
D
【单选题】造成抽样误差的主要原因是
A.
仪器设备
B.
人为因素
C.
偶然因素
D.
个体变异
E.
样本含量
【判断题】测量仪表属于发电厂、变电站电气一次设备。
A.
正确
B.
错误
【判断题】抽样误差是人为造成的。
A.
正确
B.
错误
【判断题】在抽样调查中,非抽样误差是由人为的原因造成的,因此应当尽量克服。
A.
正确
B.
错误
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