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¡¡¡¡a The production of various stereo recorders has been increeased four times as against 1977.£¨¸÷ÖÖÁ¢ÌåÉù¼Òô»úµÄ²úÁ¿±È1977ÄêÔö¼ÓÁËÈý±¶¡££©
¡¡¡¡b The output of colour television receivers increased by a factor of 3 last year.£¨È¥Äê²ÊÉ«µçÊÓ½ÓÊÕ»úµÄ²úÁ¿Ôö¼ÓÁ˶þ±¶¡££©
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¡¡¡¡£¨1£©The automatic assembly line can shorten the assembling period£¨by£©ten times.£¨×Ô¶¯×°ÅäÏßÄܹ»Ëõ¶Ì×°ÅäÆÚÊ®·ÖÖ®¾Å¡££©
¡¡¡¡£¨2£©This metal is three times as light as that one.£¨ÕâÖÖ½ðÊô±ÈÄÇÖÖ½ðÊôÇáÈý·ÖÖ®¶þ£©µÚ¶þÖÖ±í´ï·½Ê½Îª¡°n times + ¼õÉÙÒâÒåµÄ±È½Ï¼¶¡±¡£
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¡¡¡¡£¨1£©All of the heat supplied to the enginc is not converted into useful workµÄ .£¨²¢·Ç¹©¸øÈÈ»úµÄËùÓÐÈÈÁ¿¶¼±»×ª±äΪÓÐÓõŦ¡£´íÒ룺ËùÓй©¸øÈÈ»úµÄÈÈÁ¿¶¼Ã»Óб»×ª±äΪÓÐÓõŦ¡££©
¡¡¡¡£¨2£©Every one cannot do these tests.£¨²¢·ÇÈËÈ˶¼ÄÜ×öÕâЩÊÔÑé¡£´íÒ룺ÿ¸öÈ˶¼µÄ ²»ÄÜ×öÕâЩÊÔÑé¡££©
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¡¡¡¡£¨4£©This plant does not always make such machine tools.£¨Õâ¸ö¹¤³§²¢²»×ÜÊÇÖÆÔìÕâÑùµÄ»ú´²¡£´íÒ룺Õâ¸ö¹¤³§×ÜÊDz»ÖÆÔìÕâÑùµÄ»ú´²¡££© µ«Êǵ±£¨ÕâЩ×ÜÀ¨´Ê + ¿Ï¶¨Ê½Î½Óï + º¬·ñ¶¨ÒâÒåµÄµ¥´Ê¡¡£©Ê±£¬ÔòÊDZíʾȫ²¿·ñ¡£ÀýÈ磺
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¡¡¡¡£¨1£©The speed of wave is the distance it advances per unit time.£¨²¨ËÙÊDz¨ÔÚµ¥Î»Ê±¼äÄÚÇ°½øµÄ¾àÀ룩¡£
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¡¡¡¡£¨3£©stainless steel,whick is very popular for its resistance to rusting,contains large percentage of chromium.£¨¾ßÓÐÍ»³ö·ÀÐâÐÔÄܵIJ»Ðâ¸Öº¬¸õµÄ°Ù·Ö±ÈºÜ¸ß¡££©
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¡¡¡¡£¨1£©Each kind of atom seems to have a definite number of¡°hand¡±that it can use to hold on to others.
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¡¡¡¡£¨2£©Let AB in the figure above represent an inclined plane the surface of which is smooth and unbending.
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¡¡¡¡£¨1£©Such a slow compression carries the gas through a series of states.each of which is very nearly an equilibrium state and it is called a quasi-static or a¡°nearly static¡±process.
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¡¡¡¡£¨2£©Friction wears away metal in the moving parts,which shortens their working life.
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¡¡¡¡£¨1£©There are bacteria that help plants grow,others that get rid of dead animals and plants by making them decay,and some that live in soil and make it better for growing crops.
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¡¡¡¡£¨2£©There is a one-seater which you could learn to drive in fifty minutes.
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