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【简答题】
Identifying Main Points Each of the ten statements below contains information given in one of the sections in the text. Each section is marked with a letter. Have students identify the section from which the information is derived. ( ) 1. Good health as a concept is now broader than it used to be. ( ) 2. Advertisements for possibly dangerous medicines and cosmetics should be controlled by law. ( ) 3. Having a good diet and regular exercise is a winning combination. ( ) 4. About 75% of young people go to bed quite late. ( ) 5. The vast majority of young people who use weight-control products feel that these products are safe. ( ) 6. Young people tend to judge health by a person’s physical appearance. ( ) 7. Regular medical check-ups are not just for the elderly. ( ) 8. Most young people want to be slim and beautiful. ( ) 9. About a third of the young people surveyed felt that they were overweight. ( ) 10. Nearly 25% of the young people surveyed go to bed the following morning.
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举一反三
【简答题】晶体管工作在放大区时,发射结为______;集电结为______;工作在饱和区时,发射结为______;集电结为______。 A.正向偏置 B.反向偏置C.零偏置
【单选题】根据问题选择正确答案
A.
上小学前
B.
上小学后
C.
上中学前
D.
上中学后
【单选题】两个变量X和Y之间的Pearson系数r=0.8,可视为()。
A.
X和Y负相关
B.
X和Y高度相关
C.
X和Y中度相关
D.
X和Y低度相关
【判断题】凤仙花是凤仙花科多年生草本,较耐寒,怕暑热。
A.
正确
B.
错误
【单选题】下列叙述正确的是
A.
r=0.7,可认为两个变量存在相关
B.
r=0.7,经检验假设后,可认为两个变量存在相关
C.
r=0.9,可认为两个变量存在相关
D.
r=0.2,可认为两个变量不存在相关
E.
以上均不对
【单选题】( ) 是被固定地安装在运行线路一定位置,用以指示列车运行和调车工作的信号,如信号机、行车信号标志牌、信号表示器等
A.
手信号
B.
固定信号
C.
移动信号
D.
徒手信号
【判断题】柔性约束的约束反力作用在连接点,其方向沿着柔索背离物体。
A.
正确
B.
错误
【简答题】系统科学理论是信息论、( )、系统论的总称。
【简答题】柔性约束的约束反力作用在接触点,约束反力方向为______。
【简答题】2—8 柔性约束的约束反力作用在接触点,约束反力方向为______。
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