The schematic design and preliminary budget for the Reimagine Miller project were approved by the Marshalltown Community School District Board of Education during the regular Monday meeting ...

发动机用420厂仿制测绘于波音707的JT3D-3B涡轮风扇发动机的“915"发动机。 方案是定了，但整体油箱的结构如何密封、客舱如何气密设计、发动机吊挂设计和选材、平尾微调的设计等十几个技术问题设计人员都未接触过，也无资料可查，靠自己去思考。试验 ...

On December 17, 1944, Lt. Edwin Cottrell embarked on a crucial mission with the Pratt & Whitney R-2800 engine powering his P-47 Thunderbolt. Now at 103, he credits his survival to this reliable ...

简要描述：维氏硬度压痕测量仪适用于对金属材料布氏硬度、维氏硬度的测量分析工作。通过其特定的电子光学采样系统对硬度压痕形貌进行全视野实时采样，可完成对布氏硬度、维氏硬度压痕的测量自动得出硬度值。操作方便，准确率高，并能进行以往手工不 ...