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【单选题】
Are You Getting Enough Sleep? What happens if you don't get enough sleep? Randy Gardner,a high school student in the UnitedStates,wanted to find out. He designed an experiment on the effects of sleeplessness for a school science project. With doctors watching him carefully,Gardner stayed awake for 264 hours and 12 mi-nutes. That's eleven days and nights without sleep ! What effect did sleeplessness have on Gardner? After 24 hours without sleep, Gardner started havingtrouble reading and watching television The words and pictures were too blurry(模糊). By the third day,hewas having trouble doing things with his hands. By the fourth day, Gardner was hallucinating(产生幻觉). Forexample,when he saw a street sign, he thought it was a person. He also imagined he was a famous footballplayer Over the next few days,Gardner's speech became so slurred(楚)that people couldn't understandhim He also had trouble remembering things. By the eleventh day,Gardner couldn't pass a counting test. Inthe middle of the test he simply stopped counting. He couldn't remember what he was doing. When Gardner finally went to bed, he slept for 14 hours and 45 minutes. The second night he sleptfor twelve hours, the third night he slept for ten and one-half hours,and by the fourth night, he had re-turned to his normal sleep schedule. Even though Gardner recovered quickly, scientists believe that going without sleep can be danger-ous. They say that people should not repeat Randy's experiment. Tests on white rats have shown howserious sleeplessness can be. After a few weeks without sleep,the rats started losing their fur(皮毛).And even though the rats ate more food than usual, they lost weight. Eventually the rats died. During your lifetime,you will probably spend 25 years or more sleeping. But why? What is thepurpose of sleep? Surprisingly,scientists don't know for sure. Some scientists think we sleep in orderto replenish(补充)brain cells. Other scientists think that sleep helps the body to grow and to relievestress. Whatever the reason,we know that it is important to get enough sleep. Randy Gardner studied the effects of over-sleeping.
A.
Right
B.
Wrong
C.
Not mentioned
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【判断题】MCS - 51 单片机有 5 个中断优先级。
A.
正确
B.
错误
【单选题】根据以上病情变化,首选的护理措施是
A.
保证热量
B.
半坐卧位
C.
控制感染
D.
供给足够的水量
E.
供给足够的蛋白质
【单选题】患儿,8个月。支气管肺炎,晚上突然烦躁不安,喘憋加重。呼吸60次/分,心率180次/分,心音低钝,两肺细湿啰音增多,肝比以前增大1.5cm。 根据以上病情变化,首选的护理措施是
A.
保证热量
B.
供给足够的水量
C.
供给足够的蛋白质
D.
半坐卧位
E.
控制感染
【单选题】MCS-51 单片机有( )个中断优先级
A.
2
B.
4
C.
8
D.
5
【判断题】编程时 PLC 的多个线圈可以并联也可以串联。
A.
正确
B.
错误
【多选题】学前儿童生长发育主要的形态指标有
A.
身高
B.
体重
C.
头围
D.
胸围
E.
坐高
【单选题】MCS-51单片机有几个中断优先级。
A.
1
B.
2
C.
3
D.
4
【单选题】如果多元线性回归中k个解释变量之间无多重共线性,则解释变量观测值矩阵的列的秩为( )
A.
1
B.
k
C.
k+1
D.
n
【简答题】学前儿童身体形态生长发育的项目指标,主要包括身高、体重、()、头围和坐高等。
【简答题】学前儿童生长发育的形态指标主要有 、体重、 胸围和头围。
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