皮皮学,免费搜题
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【简答题】
To send and to read email has quickly become one of the most common daily activities around the world, either for business or pleasure. 小题1: Several reasons why email has become a great tool is that it is fast, convenient, and affordable. 小题2: In the past, teachers often organized pen friends project where their students would exchange letters with another group of students in another country 小题3: And by that time, students might lose interest in the project or the class might and before a serious of meaningful exchanges can take place. 小题4: With email, however, messages can be sent at a click of a button at school, home, or an Internet café, and if you are using a free email account, the cost is free(not taking into account any Internet Service Provider fees that you have to pay). 小题5: Email has a lot to offer, for language learners and teachers in the classroom. A.In addition, students have to pay imitational postage to send the letters. B.However, the turn-arcund time for sending and receiving traditional letters can take up months. C.Now, more students are using this form of communication to improve their language skills. D.Students can develop friendships with people from around the globe. E.While chatting online, never give out personal information including your age. F.One particular activity that takes advantage of these points is a key pal exchange. G.Instead of waiting days or weeks for a response, students can receive a reply quickly.
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举一反三
【单选题】V带传动的特点有 。
A.
缓和冲击,吸收振动
B.
传动比准确
C.
能用于环境较差的场合
【单选题】下列过程中,属于物理变化的是 [     ]
A.
测定溶液PH
B.
樟脑球变小
C.
点燃的钠放入氧气中
D.
浓硫酸使蔗糖变黑
【简答题】生活中的许多现象常涉及到化学知识.下列过程属于物理变化的是(  ) A.大米酿酒 B.牛奶变酸 C.生石灰干燥食品 D.轮胎爆炸
【单选题】按照自由组合定律传递的基因位于( )上?
A.
同源染色体
B.
非同源染色体
C.
常染色体
D.
性染色体
【单选题】xt0506421范第姆特方程式主要说明()
A.
板高的概念
B.
色谱峰扩张
C.
柱效降低的影响因素
D.
组分在两相间分配情况
【单选题】An administrator needs to update the anti-virus, security patches, BIOS, and the web server software on a production system. Which of the following is the BEST method to accomplish this?()
A.
Update anti-virus, security patches, BIOS software, and then the web software.
B.
Update the web software, security patches, anti-virus, and then the BIOS.
C.
Update security patches, BIOS, web software, and then the anti-virus.
D.
The order does not matter, only one change at a time should be done.
【单选题】V 带传动的特点有( )
A.
结构复杂,不能用于两轴中心距较大场合
B.
过载打滑,会损坏薄弱零件
C.
带有接头,有弹性,缓冲、吸震、传动平稳无噪声
D.
能保证精确传动比
【单选题】下列煤和石油的加工过程中,属于物理变化的是
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石油的分馏
B.
石油的裂化
C.
煤的干馏
D.
煤的气化
【单选题】哪项是指测试对被测试对象反应水平的区分程度和鉴别能力。( )
A.
真实性
B.
可靠性
C.
区别性
D.
实用性
【单选题】下列过程中,属于物理变化的是(  )
A.
测定溶液pH
B.
樟脑球变小
C.
点燃的钠放入氯气中
D.
浓硫酸使蔗糖变黑
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