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第二章 力与物体平衡第5课时 共点力平衡方法及特例分析 班级_____ ____________【高考考点要求】 共点力的平衡 Ⅱ【专题导析】1.整体法与隔离法:正确地确定研究对象或研究过程分清内力和外力.2.平行四边形定则和三角形定则确定合矢量与分矢量的关系.3.正交分解法:物体受多个力的平衡情况.4.力的合成法: 特别适合三个力平衡时运用其中两力之和等于三个
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BOB DOUGHTY: This is SCIENCE IN THE NEWS in VOA Special English. Im Bob LAPIDUS: And Im Faith Lapidus. Today we tell about the latest research and treatments for Parkinsons disease.(MUSIC)BOB DOUGHTY
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Direct Questions-Direct questions in the present tense are regularly formulated with: Do you do I does hesheit do we do you do they.Examples: -Do we have an English class on Friday-Does she go home fo
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