第20题: [单项选择]低压蒸汽采暖系统管道中热媒的最大容许流速,符合规定的是() A. 汽水同向流动时30m/s;汽水逆向流动时20m/s B. 汽水同向流动时20m/s:汽水逆向流动时30m/s C. 汽水同向流动时25m/s;汽水逆向流动时20m/s D. 汽水同向流动时20m/s;汽水逆向流动时25m/s 参考答案:D
第27题: [单项选择]A stranger in England will be surprised to find that in that country A. people have little knowledge of football. B. girls are more interested in football than boys. C. even small boys know a lot about football. D. children are not interested in football at all. 参考答案:C