应用文写作( One possible versionDear FrankWe plan to participate in the weeklong labor practice in the school field base scheduled from August Ito 8. Im writing to invite you to Join usThe base offers free accommodations and various activities. Participants can learn to do outdoor worklike farming or gardening. The art of making tea, which interests you very much, is also taught. Whatattracts me most is that we'll learn to raise animals such as goats or rabbitsIn the practice, we can experience the value of labor and expose ourselves to a wide range of practicalskills, which will surely benefit usLooking forward to your replyYoursLiH

34.(15分(1)(5分)BCE(2)(10分)解:(1)由sinC=一,可以得到临界角45° C,将发生全反射,然后反射到BC面上E点,入射角为a=30°,设折射角为B…………2分分sInc可得 sinB分(2)由几何知识可以得到AD=一=5cm分即BD=PF==5cm2分所以CF=AC-PA-PF=212.5cm2分424

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