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【判断题】
拓展延伸是将教学内容实际、生活实际、学科发展前沿开拓延伸，以使学生了解学习的价值，拓展学生的知识面，引起学生更浓厚的学习、研究兴趣，使学生建构自己的知识网络。A.
正确
B.
错误
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举一反三
【单选题】Which of the following factors is not covered in communication noise ?
A.
external noise
B.
singing bad songs loudly
C.
internal noise
D.
semantic noise
【单选题】香农在一年发表的论文《保密系统的通信理论》,用信息论的观点对保密间题进行了全面的论述,它是信息安全发展的重要里程碑
A.
1949
B.
1965
C.
1976
D.
1969
【单选题】Which of the following is true about noise pollution?
A.
Noise pollution does not disturb our life.
B.
Noise pollution has harmful effects on humans, not on animals.
C.
Noise pollution can affect animals, but not humans.
D.
Noise pollution can have harmful effects on both humans and animals.
【单选题】"Noise" is a term scholars use for factors that interfere wuth the exchange of essages. Which type of noise is "Egotism" ?
A.
external noise
B.
physiological noise
C.
psychological noise
D.
semantic noise
【单选题】香农在( )年发表的论文《保密系统的通信理论》,用信息论的观点对保密问题进行了全面的论述,它是信息安全发展的重要里程碑
A.
1949
B.
1969
C.
1976
D.
1965
【单选题】Which of the following best states the main idea of the passage? ______
A.
Noise is a major problem most people recognize its importance.
B.
Although noise can be annoying, it is not a major problem.
C.
Noise is a major problem and has not yet been recognized as such.
D.
Noise is a major problem about which nothing can be done.
【判断题】铸造合金在冷却过程中产生的收缩分为液态收缩、凝固收缩和固态收缩。共晶成分合金由于在恒温下凝固,即开始凝固温度等于凝固终止温度,结晶温度区间为零。因此,共晶成分合金不产生凝固收缩,只产生液态收缩和固态收缩,具有很好的铸造性能。
A.
正确
B.
错误
【简答题】由于这点不自觉的私心,他把长子取名天保,次子取名傩送。意思是天保佑的在人事上或不免有龃龉处,至于傩神所送来的,照当地习气,人便不能稍加轻视了。傩送美丽得很,茶峒船家人拙于赞扬这种美丽,只知道为他取出一个诨名为"___________"。
【单选题】如果要让Linux系统在5分钟后自动关机,以下命令可以实现的是( )。
A.
shutdown –s 5
B.
shutdown –r -t secs 300
C.
shutdown –h -t secs 5
D.
reboot -5
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