Prospect Park, with its vast lake, is a magnet for all health freaks...拥有一大片湖区的普罗斯佩克特公园吸引着所有注重健康的人。Certain metals are attracted to a magnet.某些金属受磁石的吸引。The earth may be thought of as a gigantic magnet.整个地球可以想像为一块硕大无朋的磁石.F...
金属表面的空气燃料混合气层为较冷的金属所激冷.The layers of air - fuel mixture next to the metal surfaces are chilled by the cooler metal.从加工性能上说,铬钼激冷铸铁比镍铬激冷铸铁加工性能好.From the machinability, the Mo cold cast iron is liable machine.研究了天然无定形石墨砂热物理...