简述CCAR-121对民用航空器的一般要求和使用限制。
参考答案：1.本规则适用于在中华人民共和国境内依法设立的航空运营人实施的在表2-3（P104）中所列公共航空运输运行
2.合格证持有人运行的飞机应当符合下列要求：时在中华人民共和国内登记的民用飞机，并携带有效的三证
3.合格证持有人可以租用不含机组人员的国际民用航空公约缔约国所属的某国登记的民用飞机实施本规则运行，但三证需民航总局审查认可
4.合格证持有人按照本规则运行的飞机应当适型号合格审定未运输类或者通勤类的飞机，并符合本规则规定，否则不得实施本规则运行
5.合格证持有人不得使用单台发动机的飞机实施本规则运行
 June 27, 2010, is the 130th anniversary of the birth of Helen Keller, and each year the week in which her birthday falls is recognized as Deaf-Blind Awareness Week (海伦凯勒周). In honor of Helen Keller—and other members of the deaf-blind community, this week is devoted to the deaf-blind. Every year the last week of June is devoted to one thing – recognition of the deaf-blind people in our midst. While the purpose of Deaf-Blind Awareness Week is to show respect for Helen Keller, the deaf-blind woman who was born that week, the week focuses on increasing public awareness and understanding of deaf-blindness. According to the Helen Keller National Center (HKNC), about 70,000 people have hearing and vision loss. More than ten years ago, Deaf-Blind Awareness Week became an event officially recognized by the Federal government.  The story of Helen Keller is well known. Born on June 27, 1880, the healthy baby was developing normally. But at the age of 19 months, an illness left her deaf and blind. When Helen was six, her equally famous teacher, Anne Sullivan, was able to teach her to communicate. Helen Keller went on to do well in all aspects of her life: graduating from college with honors and writing, lecturing, and inspiring people worldwide.小题1: Which of the following is NOT the purpose of Deaf-Blind Awareness Week according to the passage?
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