60. The biggest problem for the NHS is ______.
A. many hospitals are too old to be used
B. some services are in the charge of individuals
C. more and more patients go to GPs for treatment
D. there is not enough money for further reform
B
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PRINT PRODUCTION MANAGER WANTED A well-known printing company, now well established in the UK and in the Far East, wishes to set up a manufacturing base in Europe. An experienced manager, responsible to the Production Director, is required to assist in setting up the department and will then take charge of the day-to-day work. The successful applicant will have had experience of modern methods and machines especially in the printing, multicolour work and finishing processes, he / she will have had at least three years’ experience in cost-effective management. A good working knowledge of English is essential. We offer excellent pay and prospects, with 4 week’s holiday a year plus public holidays, a company car, and a company pension scheme(养老金制度). Interviews will be arranged in the nearest city to applicant’s home. Write, with CV, to the Personnel Manager, Box 32507, Daily News, Kemsworth Street, Comston. United Kingdom SG186 37AH. |
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ASSISTANT PRINT PRODUCTION MANAGER An internationally recognized printing company is seeking to set up a manufacturing plant in Europe. We are appointing an assistant (male or female) to our Print Production Manager. The job-holder will carry out duties involving the buying of paper and of finishing equipment, will liaise (联络) with the supervisors of the various production lines, and will assist the Production Manager. At least three years’ experience on one or more lines as well as supervisory experience is needed. A working knowledge of English is required to communicate with colleagues in the UK. We offer excellent pay, prospects, holidays, pension scheme, sick pay, etc. Write to the Manager, Box 3526. Broad Street, Northby, Millshire BK 57PX. |
23、(浙江温州中学高三) 在如图12所示电路中，电源电动势为ε= 6V，内阻不计，小灯L上标有“6V，0.3A”字样，滑动变阻器R1的阻值范围是0-20Ω，电阻R2上标有“15Ω，4A”字样，电流表的量程为0-0.6A。甲、乙两同学在讨论滑动变阻器功率的取值范围时，产生了分歧。甲同学认为：由于电流表允许通过的最大电流为0.6A，所以通过R1的最大电流为
I1m = IAm–IL = 0.6A–0.3A = 0.3A，
这时滑动变阻器R1两端的电压为 U1m =ε–I1m R2 = 6V–0.3×15V = 1.5V
因此，滑动变阻器的最大功率为 P1m = I1m U1m = 0.3×1.5W = 0.45W。
乙同学不同意甲同学的看法，他认为滑动变阻器的功率决定于通过它的电流和它两端电压的乘积，即P1 = I1 U1，电流最大时功率未必最大，只有电流、电压的乘积最大时，功率才最大。
你认为甲、乙两位同学中，哪位同学的看法正确？如果你认为甲同学正确，请简述他正确的理由；如果你认为乙同学正确，请求出滑动变阻器R1的最大功率P1m？
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(V)，那么(
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s时，e有最大值 
V