12.(15分)(2010·潮州模拟)如图10甲所示,由两根短杆组成的一个自锁定起重吊钩,将它放入被吊的空罐内,使其张开一定的夹角压紧在罐壁上,其内部结构如图乙所示,当钢绳向上提起时,两杆对罐壁
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![12.(15分)(2010·潮州模拟)如图10甲所示,由两根短杆组成的一个自锁定起重吊钩,将它放入被吊的空罐内,使其张开一定的夹角压紧在罐壁上,其内部结构如图乙所示,当钢绳向上提起时,两杆对罐壁](/uploads/image/z/14065791-15-1.jpg?t=12%EF%BC%8E%2815%E5%88%86%29%282010%C2%B7%E6%BD%AE%E5%B7%9E%E6%A8%A1%E6%8B%9F%29%E5%A6%82%E5%9B%BE10%E7%94%B2%E6%89%80%E7%A4%BA%2C%E7%94%B1%E4%B8%A4%E6%A0%B9%E7%9F%AD%E6%9D%86%E7%BB%84%E6%88%90%E7%9A%84%E4%B8%80%E4%B8%AA%E8%87%AA%E9%94%81%E5%AE%9A%E8%B5%B7%E9%87%8D%E5%90%8A%E9%92%A9%2C%E5%B0%86%E5%AE%83%E6%94%BE%E5%85%A5%E8%A2%AB%E5%90%8A%E7%9A%84%E7%A9%BA%E7%BD%90%E5%86%85%2C%E4%BD%BF%E5%85%B6%E5%BC%A0%E5%BC%80%E4%B8%80%E5%AE%9A%E7%9A%84%E5%A4%B9%E8%A7%92%E5%8E%8B%E7%B4%A7%E5%9C%A8%E7%BD%90%E5%A3%81%E4%B8%8A%2C%E5%85%B6%E5%86%85%E9%83%A8%E7%BB%93%E6%9E%84%E5%A6%82%E5%9B%BE%E4%B9%99%E6%89%80%E7%A4%BA%2C%E5%BD%93%E9%92%A2%E7%BB%B3%E5%90%91%E4%B8%8A%E6%8F%90%E8%B5%B7%E6%97%B6%2C%E4%B8%A4%E6%9D%86%E5%AF%B9%E7%BD%90%E5%A3%81)
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