题目内容
When you (15)____of the calls you should pay for your calls.
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Section CDirections: The following is a list of items in English. After reading it, you are required to find the Chinese equivalents in the table below. Then you should put the corresponding letters in the brackets.TASK 4Example: (J) 缓冲资金 (F) 资金分配
Section DDirections: Read the following passage. After reading it, you should give brief answers to the questions or unfinished statements that follow. The answers should be no more than 3 words.TASK 5Baggage allowances for all sectors (飞机舱位) are:40 kg (88 lbs) for First Class.30 kg (66 lbs) for Second Class.20 kg (44 lbs) for Economy Class.There is no free baggage allowance for infants (婴儿) paying 10% of the adult fare. Excess baggage will be charged at the rate of 1% of the First Class adult one-way fare per kilo.21. How heavy is the baggage which a passenger of Economy Class can carry free of charge?\par ______________________.22. If a passenger of Second Class carries a baggage of 80 kg with him, then how much should he pay for the baggage?\par ______________________ of the First Class adult one-way fare.23. How much free baggage allowance is for infants?\par There is ______________________ baggage allowance for infants.24. How do passengers pay for their excess passage?\par At the ______________________ of the First Class adult one-way fare per kilo.25. What did the short passage mainly discuss?\par Compare baggage allowance for passengers ______________________.
平行单色光垂直入射在缝宽为a=0.15 mm的单缝上．缝后有焦距为f=400mm的凸透镜，在其焦平面上放置观察屏幕．现测得屏幕上中央明条纹两侧的两个第三级暗纹之间的距离为8 mm，则入射光的波长为l=_______________nm．
用波长为l的单色平行光垂直入射在一块多缝光栅上，其光栅常数d=3 mm，缝宽a=1 mm，则在单缝衍射的中央明条纹中共有________条谱线(主极大).
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