题目内容
梁的内力沿轴线变化规律的图形，称梁的______，包括______和______。
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两个______、______、______的二力组成的力系称力偶。
Man has a big brain. He can think, learn and speak. Scientists used to think that man is different from animals because he thinks and learns. They know now that animals---dogs, rats and birds---can learn. So scientists are beginning to understand that men are different from animals because they can speak. Animals cannot speak. They make noises when they are afraid, or hungry, or unhappy. Apes (类人猿) are our nearest cousins. They can understand some things more quickly than human beings, and one or two have learned a few words. But they are still different from us. They can never think about the past or the future. Language is a wonderful thing. Man has been able to develop civilization because he has language. Every child can speak his own language very well when he is four or five--but no animal learns to speak. How do children learn Scientists do not really know. What happens when we speak Scientists do not really know. They only know that man can speak because he has a big brain. According to the passage, language has played a very important part in______.
在电渣压力焊操作中，钢筋安放欠正直，可能导致焊接缺陷有______、______。
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