题型：问答题 简答题 在相同建筑条件下采用热风采暖和散热器采暖的建筑结构总计算耗热量大小，下列哪一项是正确的A．热风采暖比散热器采暖，建筑围护结构总耗热量要增大B．热风采暖比散热器采暖，建筑围护结构总耗热量要减小C．两者的围护结构总耗热量相等D．两者无法比较 查看答案
题型：问答题 简答题 关于润滑油对压缩机的影响，下列说法正确的有（）。A、油量不足或中断会引起轴承温度升高，使轴承产生咬合，严重的使巴氏合金溶化B、油不清洁会使轴瓦刮伤C、油温过高，轴承的热量不能及时带走D、油中带水会降低油的润滑性能 查看答案
题型：问答题 简答题 阅读下面对话，从方框内7个选项中选择5个恰当的句子完成此对话。A. About three or four. B. How old were you when you win the first prize? C. How long do you play each day? D. When did you start playing tennis? E. Do you want to be a professional tennis player? F. Here at the tennis club? G. Who taught you how to play?Reporter: Congratulations! You just won the first prize in the State Tennis Competition.Denny: Thank you.Reporter: Denny, how old are you?Denny: Eight.Reporter: Eight? 1 Denny: When I was three.Reporter: 2 Denny: My father. And I take private(个人的) lessons, too.Reporter: 3 Denny: Yes, I've taken lessons here for two years.Reporter: How many days a week do you play?Denny: 4 I want to practice every day, but my parents say three or four days is enough.Reporter: 5 Denny: Sure. That's my dream.Reporter: Wish you greater success! Denny: Thank you. 查看答案