管式换热器换热效果降低可通过提高冷热物料温差来处理。
参考答案：对
At the Beijing Olympics, Bolt broke the 100-meter and 200-records and became the _____man in the world.[ ]
A. fastest
B. heaviest
C. tallest
D. slowest
恶劣气候和温度对工作表现的影响。
