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1. ÎÒÃÇ¿ÉÒ԰ѸÖÔٴμÓÈȵ½ÁÙ½çζÈÒÔϵÄijһζȣ¬È»ºóÔÚÂýÂýÈÃÆäÀäÈ´¡£ We can heat the steel again to a temperature below the critical temperature, then cool it slowly.
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All these metals are not good conductors. 4. ÔÚ×ö´øµçʵÑéµÄʱºò£¬ÔÙÔõôСÐͼ²»Îª¹ý¡£
You can't be too careful in performing an experiment. 5.ÀûÓ÷¢µç»ú¿ÉÒÔ°Ñ»úеÄÜת±ä³ÉµçÄÜ¡£
The mechanical energy can be changed back into electrical energy by means of a generator or dynamo.
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Assume that the voltage input of the power supply remains the same. 7.»¯Ê¯È¼ÁÏÊÇ·¢µç¹ý³ÌÖÐ×îΪƵ·±Ê¹ÓõÄÄÜÔ´¡£
Fossil fuels are most frequently used source daring the power generation process.
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The individual reliability of machine elements becomes the basis for estimating the overall life
9. ˵ÎÒÃÇÉú»îÔÚÒ»¸öµç×Óʱ´ú£¬ÕâÒ»µã¶¼²»¿äÕÅ¡£ It's no exaggeration to say that we live in an electronic age.
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Engine revolution should not exceed the maximum permissible.
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If extremely low-cost power were ever to become available from large nuclear power plants, electrolytic hydrogen would become competitive. 12.µç×Ó¼¼ÊõÌṩÁËÒ»ÖÖеÄÏÔʾʱ¼äµÄ·½·¨¡£
A new way of displaying time has been given by electronics. 13.Ô¶¾àÀëÊäµçÐèÒª¸ßѹ£¬°²È«ÓõçÐèÒªµÍѹ¡£
High voltage is necessary for long transmission line while low voltage for safe use.
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The resistance of aluminum is approximately half again as great as that of copper for the same dimensions = size
15. In fact,it is impossible for no force to be exerted on a body,since in this world everything is subject to the force of gravity. ÊÂʵÉÏ£¬ÎïÌå²»ÊÜÍâÁ¦×÷ÓÃÊDz»¿ÉÄܵģ¬ÒòΪÔÚÕâ¸öÊÀ½çÉÏÈκÎÎïÌå¶¼ÒªÊܵ½ÖØÁ¦µÄ×÷Óá£
16.In a thermal power plant,all the chemical energy is not
converted into heat.
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17.Many elements are thoroughly standardized.Testing and practical experience have established the most suitable dimensions for common structural and mechanical parts. ºÜ¶à»úеÁã¼þÊÇÍêÈ«±ê×¼»¯µÄ¡£ÆÕͨ½á¹¹ºÍ»úе²¿¼þµÄ×îÊʺϳߴç¿ÉÒÔ½èÖú²âÊÔ»òʵ¼Ê¾ÑéÀ´È·¶¨¡£
18. Roller bearing can be classified into three basic types cylindrical roller bearing, needle roller bearing and tapered roller bearing.
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The critical temperature is different for different kinds of steel. 2. ÈËÀà±È»úÆ÷È˸üÁé»î¶øÇÒ¸ü¸»Óд´ÔìÐÔ¡£
People are so much more flexible and inventive than robots.
3. It is said that numerical control is the operation of machine tools
by numbers.
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4. The new equipment will reduce the error probability by seven times. ÐÂÉ豸µÄÎó²î¸ÅÂʽ«½µµÍÆß±¶¡£
5. Robotics is so closely associated with cybernetics that it is
sometimes mistakenly considered to be synonymous.
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7. Safety proves one of the most essential factors that should be focused
on while students are doing experiments °²È«ÊÇѧÉúÔÚ×öʵÑéÓ¦¸Ã×¢ÒâµÄ×î»ù±¾µÄÒòËØÖ®Ò»
8. The design aims at automatic operation, easy regulation, easy
maintenance and high productivity
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9. The splendid building consists of bricks and concrete.It is the atoms
that make up iron, water, oxygen and the alike.
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10. From personal point of view, the phenomenon displayed (shown) in the
chart will continue in the upcoming years.
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11. Based upon the relationship between magnetism and electricity are
motors and generators.
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1.The engine has given a constantly good performance. Õą̂·¢¶¯»úÒ»Ö±ÔËתÁ¼ºÃ¡£
2.Like charges repel each other while opposite charges attract. ͬÐÔµçºÉÏà³â£¬ÒìÐÔµçºÉÏàÎü¡£
3.The transformer works properly. Õą̂±äѹÆ÷ÔËתÕý³£¡£
4.The motor is not working. µç¶¯»ú¹ÊÕÏÁË¡£
5.The threads of the screw work hard. ÕâÂÝË¿µÄÂÝÎÆÌ«É¬ÁË¡£ 6.In order to meet the critical service requirements, scientists are still looking for better materials.
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7.At present coal is the most common food of a steam power plant. Ŀǰ£¬ÃºÈÔÈ»ÊÇÄýÆûʽµç³§×î³£ÓõÄÄÜÔ´¡£
8.In the absence of force, a body will either remain at rest, or continue to move with constant speed in a straight line.
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