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【简答题】
乙烯的分子式是 , 电子式是 , 结构式是 。乙烯分子中,碳碳原子之间有 共用电子对。
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举一反三
【单选题】He presents a new ________ to learning a foreign language, which I think is of great value.
A.
approach
B.
means
C.
method
D.
way
【单选题】At the meeting they discussed three different ______ to the study of mathematics.
A.
approaches
B.
means
C.
methods
D.
ways
【单选题】一大一小两个匀质圆盘同轴地 粘结在一起构成一个组合轮。小圆盘的半径为 r 质量为 m ;大圆盘的半径为 R=3r ,质量 M=3m 。组合轮可绕通过其中心且垂直于盘面的光滑水平固定轴 O 转动,随 O 轴的转动惯量 J=14mr 2 . 两圆盘边缘上分别绕有轻质细绳,其下端各悬挂质量为 m 的物体 A 和 B ,如图所示。这一系统从静止开始运动,绳与盘无相对滑动,绳的长度不变。已知 r=5cm. ...
A.
15.8
B.
16.3
C.
18.6
D.
21.3
【单选题】It can be inferred from the text that
A.
the behavior. of alcoholics contradicts the approach-avoidance theory.
B.
the behavior. of most alcoholics proves the learning theory.
C.
punishment may become the stimulus for another time of drinking.
D.
frequent excessive drinking makes alcoholics indifferent to punishment.
【简答题】A.To review material covered in an earlier lecture. B.To change students approach to writing. C.To point out an example of good writing. D.To give an assignment for the next class.
【单选题】The writer suggests that success in America depends upon
A.
adopting a more American approach to marketing.
B.
persuading the mid-range consumer to pay for quality.
C.
copying the strategies of American companies.
D.
building a reputation as a supplier of unique goods.
【单选题】涓滴效应指在经济发展过程中并不给予贫困阶层、弱势群体或贫困地区特别的优待，而是由优先发展起来的群体或地区通过消费、就业等方面惠及贫困阶层或地区，带动其发展和富裕。
根据上述定义，下列属于涓滴效应的是（）。
A.
国家加大对西部扶贫力度
B.
政府为应届毕业大学生创业营造便利条件
C.
劳动部门为下岗职工举办免费技能培训班
D.
五一假期城市近郊农家乐旅游逐年升温
【单选题】Erasmus's work was criticized as heresies because______.
A.
he adapted the Bible
B.
he approached the scripture in a scholarly fashion
C.
he appraised the scripture critically
D.
he understood the scripture rationally
【单选题】The students were advised to try a different ________ to solving the complex maths problem.
A.
approach
B.
means
C.
method
D.
way
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