问题
问答题 计算题
计算下图所示弯曲件的展开长度。已知中性层移动系数K取0.45。
答案
参考答案：
中性层半径=10＋5×0.45=10＋2.25=12.25（mm）
展开长
L=2（80-30）＋（120-30）＋（180-120-20）＋2×12.25×3.14
=100＋90＋40＋76.93
=306.9（mm）
展开长是306.9毫米。
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计算下图所示弯曲件的展开长度。已知中性层移动系数K取0.45。
参考答案：
中性层半径=10＋5×0.45=10＋2.25=12.25（mm）
展开长
L=2（80-30）＋（120-30）＋（180-120-20）＋2×12.25×3.14
=100＋90＋40＋76.93
=306.9（mm）
展开长是306.9毫米。
Jack arrived in a big city of China. When he got off the train, he felt very hungry (饥饿的） and wanted to ___1___some food. But he didn’t know___2___to get to a food shop, so he bought a___3___of the city. Jack read the map carefully. Then he walked along Heping Street and ___4___right when he saw the traffic lights. But he was___5___ . He didn’t find any food shops there! Jack went to ask a policeman___6___help. He couldn’t speak any Chinese, so he ___7___ a piece of paper and drew a food shop on it. The policeman was___8___and he knew what Jack wanted to do. He told Jack to go___9___the bridge and then walk on for about ___10___The food shop was next to a big hospital. Jack found the food shop at last.
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CH3OH(g)