问题
选择题
三棱锥P-ABC，PA⊥面ABC，AC⊥BC，点E、F分别是A在PB、PC上的射影，则（ ）
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答案
答案：C
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三棱锥P-ABC，PA⊥面ABC，AC⊥BC，点E、F分别是A在PB、PC上的射影，则（ ）
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答案：C
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| A generation gap (代沟) has become a serious problem. I read a 1 about it in the newspaper. Some children have killed themselves after quarreling with 2 . I think this is because they don't often have a talk with each other. Parents now 3 more time in the office, 4 they don't have much time to stay with their children. As time passes, they both feel that they don't have the 5 topics (话题) to talk about. I want to tell parents to be more with your 6 , get to know them and 7 them. And for children, show your 8 to your parents. They are the people who love you. So 9 them your thoughts (想法). In this way, you 10 have a better understanding of each other. | |||
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