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【单选题】
波长 的单色光垂直照射到宽度 的单缝上,单缝后面放置一凸透镜,在凸透镜的焦平面上放置一屏幕,用以观测衍射条纹。今测得屏幕上两个 3 级暗条纹之间的距离为 12mm ,则凸透镜的焦距 为 [ ]
A.
2 m
B.
1 m
C.
0.5 m
D.
0.2 m
E.
0.1 m
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参考答案:
举一反三
【判断题】若从某一初态经可逆与不可逆两条途径到达同一终态,则不可逆途径的熵变必大于可逆途径的熵变( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】人类对传播理论的研究于20世纪40年代末开始迅速发展,揭示了教学过程中各种动态的相互联系。请问采用了“5W”公式清晰描述了大众传播过程中五个基本要素的是哪一传播模式?( )
A.
香农 — 韦弗传播模式
B.
贝罗传播模式
C.
拉斯威尔传播模式
D.
海曼 —弗朗克传播模式
查看完整题目与答案
【判断题】若从某一初态经可逆与不可逆两条途径到达同一终态,则不可逆途径的熵变必大于可逆途径的熵变( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】A) The long distance between his home town and New York. B) His unpopular character. C) The high unemployment rate in New York. D) His criminal record.
A.
The long distance between his home town and New York.
B.
His unpopular character.
C.
The high unemployment rate in New York.
D.
His criminal record.
查看完整题目与答案
【单选题】John is happier at his new job than his old one. What does that mean?
A.
He was less happy at his old job than his new one.
B.
He is less happy at his new job than his old one.
C.
He isn’t as happy at his new job than his old one.
查看完整题目与答案
【单选题】属于食品中挥发酸成分的是( )
A.
乙酸
B.
乳酸
C.
琥珀酸
D.
山梨酸
查看完整题目与答案
【单选题】下列关于数据库表与自由表的叙述中,错误的是 ( )
A.
数据库表可以转变为自由表
B.
自由表可以转变为数据库表
C.
数据库表和自由表的默认扩展名都是.dbf
D.
数据库表和自由表都能为字段设置默认值
查看完整题目与答案
【判断题】购买一套二手房(2015年建),房价90万元。
A.
正确
B.
错误
查看完整题目与答案
【单选题】属于食品中挥发酸成分的是( )
A.
乙酸
B.
乳酸
C.
山梨酸
D.
琥珀酸
查看完整题目与答案
【简答题】His telescope and his experiments were always bringing him new surprises, and he made notes of his work every day.
查看完整题目与答案
相关题目:
【判断题】若从某一初态经可逆与不可逆两条途径到达同一终态,则不可逆途径的熵变必大于可逆途径的熵变( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】人类对传播理论的研究于20世纪40年代末开始迅速发展,揭示了教学过程中各种动态的相互联系。请问采用了“5W”公式清晰描述了大众传播过程中五个基本要素的是哪一传播模式?( )
A.
香农 — 韦弗传播模式
B.
贝罗传播模式
C.
拉斯威尔传播模式
D.
海曼 —弗朗克传播模式
查看完整题目与答案
【判断题】若从某一初态经可逆与不可逆两条途径到达同一终态,则不可逆途径的熵变必大于可逆途径的熵变( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】A) The long distance between his home town and New York. B) His unpopular character. C) The high unemployment rate in New York. D) His criminal record.
A.
The long distance between his home town and New York.
B.
His unpopular character.
C.
The high unemployment rate in New York.
D.
His criminal record.
查看完整题目与答案
【单选题】John is happier at his new job than his old one. What does that mean?
A.
He was less happy at his old job than his new one.
B.
He is less happy at his new job than his old one.
C.
He isn’t as happy at his new job than his old one.
查看完整题目与答案
【单选题】属于食品中挥发酸成分的是( )
A.
乙酸
B.
乳酸
C.
琥珀酸
D.
山梨酸
查看完整题目与答案
【单选题】下列关于数据库表与自由表的叙述中,错误的是 ( )
A.
数据库表可以转变为自由表
B.
自由表可以转变为数据库表
C.
数据库表和自由表的默认扩展名都是.dbf
D.
数据库表和自由表都能为字段设置默认值
查看完整题目与答案
【判断题】购买一套二手房(2015年建),房价90万元。
A.
正确
B.
错误
查看完整题目与答案
【单选题】属于食品中挥发酸成分的是( )
A.
乙酸
B.
乳酸
C.
山梨酸
D.
琥珀酸
查看完整题目与答案
【简答题】His telescope and his experiments were always bringing him new surprises, and he made notes of his work every day.
查看完整题目与答案
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