问题
单项选择题
车轮不平衡所产生的离心力是以（）作用在离车式硬支承电测式平衡机的支承装置上，只要测出作用在支承装置上的力或因此而产生的振动，就可测得车轮的不平衡量。
A.位移形式
B.振动形式
C.力的形式
D.轴向振动
答案
参考答案：C
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车轮不平衡所产生的离心力是以（）作用在离车式硬支承电测式平衡机的支承装置上，只要测出作用在支承装置上的力或因此而产生的振动，就可测得车轮的不平衡量。
A.位移形式
B.振动形式
C.力的形式
D.轴向振动
参考答案：C
| 阅读理解。 |
| Newton was born on Christmas, 1642, in a small village in England. His father, a farmer, died when he was young. He liked to repair clocks and make toys. He also was interested in astronomy (天文学). Newton went to school at twelve. Soon after he had to stop as his mother wanted him to do farm work. When she found her son was so interested in science, Mrs. Newton sent him to Cambridge (剑桥) University to study. He was 19 at that time. Sometimes he had to work as a servant to go on his study. There he became a famous scientist. At 23 he invented methods of calculation (计算) which have been used to nowadays. In 1665 he had to leave the university and go home where he made two of his great discoveries. One is that he found the colour of sunlight was made up of seven kinds. The other was the founding of force of gravity (地心引力), which was one of the most important theories (理论) for modern science. |
| 1. Newton was a great scientist. He ______. |
[ ] |
| A. discovered the law of nature B. discovered the force of gravity C. discovered the universe |
| 2. Mrs. Newton hoped her son could become a ______. |
[ ] |
| A. worker B. scientist C. farmer |
| 3. In Cambridge Newton often worked as a ______ to go on his study. |
[ ] |
| A. student B. servant C. scientist |
| 4. Newton's first discovery was ______. |
[ ] |
| A. 7 colours of the sunlight B. light C. lens |
| 5. Newton stopped studying when he was young, because ______. |
[ ] |
| A. his father died B. his mother wanted him to be a farmer C. his family was poor |