题目内容

凡高度在（）m之内的传动部件、转轴、联轴节、飞轮、电锯等危险零部件及其危险部位，都必须设置防护装置。

A. 2
B. 2.5
C. 3

查看答案

搜索结果不匹配？点我反馈

更多问题

Exercise One: Fill in the blanks with words or phrases from the box below. Change the form where necessary.1. Good teachers should encourage students to use their to express themselves and make them feel proud of what they can achieve.2. I've made new friends and am at college. I think I'm enjoying being a college student.3. People with disabilities want to be treated like everyone else and given equal opportunities. They do not want .4. Life is full of . We should be strong enough to face up to them.5. A great pianist does not succeed overnight. His skills are developed .6. It is reported that millions of people in the US are not covered by health .7. The party really once again when the huge birthday cake was served.8. The train must be running late; we should have got to Beijing .9. How determined one is to achieve one's dream is clearly a sign that can be used to success.10. Setting a goal and going to achieve it can be a great test of one's will and perseverance.11. The doctor tried to prevent the spreading to other parts of the body.12. I was told that my computer wasn't powerful enough to run that .13. executives usually have high salaries.14. The art exhibition is great; it's a pity you don't have time to go there but you can see it on your computer .15. The researchers are concerned about the increasing __ of the illness in the village.

Exercise Two: Replace the underlined part in each of the following sentences with a word or phrase from the box below. Write your answer in the brackets. Make changes or additions where necessary.1. I'm a tech fan andreally like Apple products for their cool designs. ( )2. Instead of going to school, this disabled man taught himself through to college level. ()3. If you ask me what is my reason for becoming a teacher, I think I've always dreamed of becoming one because teaching is a creative job. ()4. I personally don't believe that there's a way of telling in advance how successful a little kid will become twenty years from now. ()5. I made up my mind to study computer science, and became extremely interested. ()6. He will not easily give up and will continue his long search for happiness. ( )7. The questions were so simple that he easily passed the test. ()8. My father taught me to play traditional music on the flute when I was ten. ()9. Since the debate (辩论), it seems that Dr. Smith's point of view has become dominant. ()

若物体系中所有未知量数目不超过独立方程个数，则所有未知量可由平衡方程解出，这类问题称为。

若物体系中所有未知量数目超过独立方程个数，这类问题称为。