毛石砌体有几种组砌形式有什么要求？
参考答案：
毛石砌体的组砌形式一般有三种：一是丁顺分层组砌法；二是丁顺混合组砌法；三是交错混合组砌法。前两种方法适用于石料中既有毛石，又有条石和块石的情况；第三种方法适用于毛石占绝大多数的情况。由于所用的石料不规则，要求每砌一块石头要与左右上下有叠靠、与前后有搭接、砌缝要错开。每砌一块石头，都要放置稳固。有的毛石要用垫片稳固，但要求每一块至少有四个点能与上下左右的其他石块有直接叠靠，不能只靠垫片起作用。由于毛石砌体所用石料多数是不规则的。在砌筑时叠靠点应居于石块的外半部，而且要选择较大的较整齐的面朝外，每隔一定距离要砌一块拉结石。毛石的组砌形式如图所示。
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| "Can I see my baby?" the happy new mother asked. When the 1 was put into her arms, she felt sad. The baby had been born without 2 . But the baby's hearing was 3 . When the boy ran home from school one day and 4 in her arms, she knew that her son's life would be 5 . The boy's father asked the doctor 6 something could be done." I believe I could put a pair of ears on him if they could be 7 ," the doctor said. Two years went by. "You are going to the 8 son," said the father one day. 9 would give you the ears." The operation was very 10 , and the boy's life became beautiful. The boy asked his father. "Who 11 so much for me? I could never do enough for him." "It's a secret," said his father quietly. The years kept their secret, but the day did come. It was one of the 12 days for the son. He stood with his father over his mother's casket (棺材). 13 , the father raised the mother's long thick hair to 14 that the mother had no ears! "Mother said she was happy that she never had her hair 15 ," he said. "And nobody had ever thought Mother less beautiful, had they?" | ||||
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