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【简答题】
阅读理解。 Square Dance ABC HOME PAGE Square Dance ABC is an exciting new way to practice square dancing. Enjoy a funny, easy beginner's square dance, with no experience needed. There are three different dances. The A, B and C dances can be experienced in any order. This is the main difference between Square Dance ABC and the traditional 'lesson-based' way. You can do the three beginner's dances in any order. Instead of waiting until a class starts once a year, people can start Square Dance ABC any time! After all three dances (in any order), dancers have learned 22 square dance movements. The next step is the experienced ABC dance, using all 22 movements. It is easy to convince people to try square dancing any time. Most people that try it will likeit. Square Dance ABC will bring lots of opportunities for fun, fitness and friends! Come on, we'll make this project as easy as A-B-C! If you have questions or comments about this site, please e-mail us at Webmaster@SquareDanceABC.com. 1. Who might be interested in this website? A. Kids that are good at drawing. B. Adults that want to go traveling. C. People that want to learn to dance. 2. If you want to join Square Dance ABC, you _____. A. must have square dancing experience B. can start any time C. need to get lots of friends to help you 3. Which one of the following is the traditional 'lesson-based' way to learn square dancing? A. Dancing only with one's friends. B. The dance movements must be learned in order. C. The three A, B and C dances can be learned in any order. 4. If you join the Square Dance ABC, you can _____. A. save lots of money for a holiday B. try square dancing only once C. stay healthy and make lots of friends 5. The passage is probably _____. A. an advertisement by an English club B. an invitation by an English club C. an advertisement by a dance club
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【单选题】Pn,且在起点处相切于P0P1,在终点处相切于Pn-1Pn? ( )
A.
增加端点P0/=2P0-P1,Pn/=2Pn-Pn-1
B.
增加端点P0/=P0-2P1,Pn/=Pn-2Pn-1
C.
将原端点替换为P0/=2P0-P1,Pn/=2Pn-Pn-1
D.
将原端点替换为P0/=P0-2P1,Pn/=Pn-2Pn-1
【简答题】R的运行环境可以在哪些操作系统下运 行 、 、 ?
【简答题】R的运行环境可以在哪些操作系统下运 行 、 、 ?
【单选题】引起中药发生质量变异的内因之一是
A.
中药含水量
B.
空气
C.
高温
D.
湿度
【简答题】利用万用表测量晶体二极管内PN结的()电阻值,可以大致判别出晶体极管的()、()和PN结的材料。
【简答题】如用表测得PN零明()。
【单选题】引起中药发生质量变异的内因之一是
A.
空气
B.
湿度
C.
中药含水量
D.
高温
【单选题】用数字万用表的 PN 结专用量程检测二极管的 PN 结单向导通时,表上显示的数据是
A.
PN 结的正向导通压降值
B.
PN 结的正向导通电流值
C.
PN 结的正向耐压值
D.
PN 结的反向耐压值
【单选题】VHF 设备双工信道的收发频率间隔是_____。(130756:第9章 VHF与VHF-DSC设备) (A-0,B-0,C-0,D-0,错误-0)
A.
4.6MHz
B.
25 KHz
C.
50 KHz
D.
12.5 KHz
【单选题】绝对压力Pa与表压力Pr的关系是( )(Pn代表标准大气压力)。
A.
Pa=Pr+Pn;
B.
Pr=Pa+Pn;
C.
Pr=Pa;
D.
Pa=Pr-Pn。
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