题目内容
缩短机动时间（基本时间）的措施有：（1）减少加工余量；（2）加大切削用量；（3）缩短工件的装夹时间。
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The normal human daily cycle of activity is of some 7-8 hours’sleep alternation with some 16-17 hours’wakefulness and that the sleep normally coincides (1) the hours of darkness．Our present concern is with how easily and to what extent this (2) can be modified． The question is no mere academic one．The ease with which people can change from working in the day to working at night is a (3) of growing importance in industry where automation (4) round-the-clock working of machines．It normally (5) from five days to one week for a person to adapt to a (6) routine of sleep and wakefulness，sleeping during the day and working at night． (7) ，it is often the case in industry that shifts are changed every week．This means that no sooner has he got used to one routine (8) he has to change to another， (9) much of his time is spent neither working nor sleeping very (10) ． One answer would seem to be (11) periods on each shift，a month，or even three months． (12) ，recent research has shown that people on such systems will revert to go back to their (13) habits of sleep and wakefulness during the weekend and that this is quite enough to destroy any (14) to night work built up during the week．The only real solution appears to be to hand over the night shift to those permanent night workers whose (15) may persist through all weekends and holidays．
Scientists around the world are racing to learn how to rapidly diagnose，treat and stop the spread of a new，deadly disease．SARS—Severe Acute Respiratory Syndrome—was (1) for the first time in February 2003 in Hanoi， (2) since then has infected more than 1，600 people in 15 countries，killing 63．At this (3) ，there are more questions than answers surrounding the disease． Symptoms start (4) a fever over 100．4 degrees F，chills，headache or body (5) ．Within a week，the patient has a dry cough，which might (6) to shortness of breath．In 10% to 20% of cases，patients require (7) ventilation to breathe．About 3.5% die from the disease．Symptoms (8) begin in two to seven days，but some reports suggest it (9) take as long as 10 days．Scientists are close to (10) a lab test to diagnose SARS．In the meantime，it is diagnosed by its symptoms．There is no evidence (11) antibiotics or antiviral medicines help， (12) 至doctors can offer only supportive care．Patients with SARS arekept in isolation to reduce the risk of (13) ．Scientists aren’t sure yet，but some researchers think it’s a (14) discovered coronavirus，the family of viruses that cause some common colds． Most cases appear to have been passed (15) droplets expelled when infected patients cough or sneeze．Family members of infected people and medical workers who care (16) them have been most likely to (17) the illness．But recent developments in Hong Kong suggest that the (18) might spread through air，or that the virus might (19) for two to three hours on doorknobs or other (20) ．Health experts say it is unlikely，though，that sharing an elevator briefly with an infected person would be enough to pass the virus．
案例分析题阅读孟郊的《游子吟》然后回答下列问题。慈母手中线，游子身上衣。临行密密缝，意恐迟迟归。谁言寸草心，报得三春晖。 从结构上，本诗可分哪两层各层意思是什么？
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