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当前学科：机电工程管理与实务
题目：
单选题
高层建筑管道施工中，铜管连接当管径大于或等于2mm时宜采用（）
A
对口焊接
B
专用接头
C
热熔连接
D
套管焊接
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I had my first chocolate bar at five years old. Ill never forget the【C1】______, comforting taste. But the circumstances were【C2】______but sweet. It was World War H . I【C3】______with my family in the Lithuanian town of Taurage【C4】______the Russian army swept west toward Nazi Germany. Many people in our village【C5】______away in terror. In the confusion, I stood with my 12-year-old sister, and my three-year-old brother, near the railway【C6】______, where a train for Germany waited.【C7】______families were allowed to board the train. Just before leaving, a woman traveling【C8】______approached us. "Ill take care of him," she told my sister, and【C9】______me onto the train as it left the station. The entire trip I【C10】______my mother. We arrived in Hamburg. Now that the woman had【C11】______Taurage she had no more use for me. I lived on the【C12】______like thousands of other children in that wartorn city. I survived 【C13】______stealing food. Then the American occupation troops arrived. One afternoon as I hid【C14】______in a mess tent in search of food, a huge hand lifted me up by the collar—an American soldier. I was【C15】______and I could see it upset him. "Its okay, kid," he said. He reached into his jacket and handed me a chocolate bar. I【C16】______it and took a small bite. I thought Id gone to heaven. The soldier took me and some other【C17】______children to an orphanage run by Red Cross. Fours years later I was transferred to an orphanage in America. 【C18】______a family who lived in Pennsylvania adopted me. Later I joined the Army, then attended college after the army and【C19】______a masters degree in clinical social work. I never did learn the soldier God sent to save my life, but I will remember his【C20】______forever.【C1】A．poorB．badC．terribleD．delicious