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第一周 单元测验

1、单选题：
​将一个点电荷q 放在一个立方体的中心，则通过立方体一个面的电通量是（   ）‎
选项：
A: ‍
B:
C:
D:
E:
F:
G:
答案: 【 ;
】点我阅读全文

第一周 单元测验

1、单选题：
​关于电偶极子的概念，其说法正确的是‏
选项：
A: 其电荷之间的距离远小于问题所涉及的距离的两个等量异号的点电荷系统。
B: 一个正点电荷和一个负点电荷组成的系统。
C: 两个等量异号电荷组成的系统。
D: 一个正电荷和一个负电荷组成的系统。
E: 两个等量异号的点电荷组成的系统。
答案: 【 其电荷之间的距离远小于问题所涉及的距离的两个等量异号的点电荷系统。】点我阅读全文

第一章 单元测试

1、判断题：
​跨国公司单纯的生产经营活动不涉及东道国的政治行为，因此不需要考虑复杂的政治环境对生产经营和投资带来的影响。（ ）‌
选项：
A: 正确
B: 错误
答案: 【 错误】点我阅读全文

第一章 单元测试

1、判断题：
‍中国对外贸易的迅速发展，对世界经济具有重要拉动作用。（   ）​
选项：
A: 正确
B: 错误
答案: 【 正确】点我阅读全文

Unit 1 Quiz 1

1、单选题：
Christopher Reeve -- A Real Superman‏He was "faster than a speeding bullet, more powerful than a locomotive, able to leap tall buildings in a single bound." He was the world’s greatest superhero. When Christopher Reeve was picked to play this role in films in 1977, audiences across the country cheered with approval. Like Superman, Christopher was dashing, handsome, and strong. Like Superman, he seemed nearly invincible. He skied, sailed, flew planes, went scuba diving, rode horses, played tennis -- and did it all with skill and ease. No one could imagine Christopher Reeve any other way.‏All that changed on May 27, 1995. Christopher was in Virginia with his wife, Dana Morosini, and their young son, Will. He had entered a three-day horse riding competition there. His horse, Eastern Express, appeared to be in fine shape. The 42-year-old Christopher looked equally fit and relaxed.‏The competition was going well for Christopher. He wasn’t in the first place, but he wasn’t in the last, either. On his third obstacle in a two-mile jumping event, however, the communication between horse and rider broke down somehow. Without warning, Eastern Express stopped short, but Christopher kept going. He pitched forward over the horse’s head, landing on his own head -- not moving, not even breathing.‏Christopher had broken his spinal cord near the base of his skull, resulting in paralysis from the neck down. He could not speak. He could not even breathe on his own. At the time, doctors gave him only a 50-50 chance of surviving at all.‏Despair filled Christopher Reeve’s heart. He thought perhaps it would be best if he simply gave up. Dying seemed like the easiest and least painful thing to do. He thought it might be best for his family, too. Then he saw his wife Dana standing next to him, saying, "You’re still you, and I love you."‏From that moment on, Christopher thought only about living. Gathering his courage, he began to fight for his life. A few days later, Christopher underwent an operation that helped restore some feeling to his upper body. Still, doctors emphasized his limitations. He would never walk again. He would never even breathe again without the aid of a respirator.‏Christopher set out to prove the doctors wrong. First of all, he wanted to breathe on his own. Five months after the accident, he asked to be taken off the respirator. He managed just 10 feeble breaths before being reconnected to the breathing tube. Refusing to be discouraged, Christopher took a few more breaths the next day. By the fourth day, he was able to breathe seven minutes without assistance. After three months, he could sustain himself for 90 minutes at a time. By the end of 1995, he was able to go home.‏Soon after that, Christopher felt ready to face the world again. He had a message to spread. He wanted to tell people that no matter what challenges they faced, they shouldn’t give up. Christopher began to make public appearances. He gave a motivational speech in Toronto. He spoke at a Boston University graduation. Wherever Christopher appeared, his speeches met with standing ovations -- and many teary faces.‏Christopher also went back to work. Clearly he couldn’t play the roles he’d played in the past. Instead he turned to directing. His first film, In the Gloaming, proved he had not lost his creative spark.‏Despite his brave attitude, Christopher has had his share of "down" times. In the year following his accident, he had problems with blood clots. Later, he developed pneumonia. One day while doing physical therapy, he fell to the floor and broke his arm.‏Every day he struggled with the reality of his condition. "In the morning, I need 20 minutes to cry," he told a reporter. After night-time dreams of running and playing with his son, he needed the 20 minutes "to wake up and make that shift ..."‏But after the tears, Christopher always whispered, "And now, forward!" With those words, Christopher Reeve proved that although he had lost control of his body, he still had his courage, his spirit, and his inner strength. In that sense, he still was -- and always would be -- Superman!‏1. From the first paragraph we can learn that Christopher was _____.‏
选项：
A: a superman
B: a film actor
C: a diver
D:  a rider
答案: 【 a film actor】点我阅读全文

【在线测试】点我阅读全文

综合测试

1、单选题：
‏ ‍本课程的研究对象是下列哪一选项？‍‏‍
选项：
A: 机械的运动设计
B: 机械结构设计
C: 机械的精度设计
D: 机械系统设计
答案: 【 机械的精度设计】点我阅读全文