Zhen Yu company is committed in the design , derelopment production and distributing of warning lightings, siren and loudhailer.振宇公司是专业从事警示灯 、 警报器扬声器的设计、开发、生产及销售的企业....
压气机出口压力沿圆周方向接近于常数.The compressor - outlet pressure is nearly constant around the circumference.文中也包括了离心压气机设计的基本步骤.The essential design procedure about centrifugal compressor also included in the paper.活塞发动机和涡桨发动机的飞机有压气机来...
他摇摇头，用纸巾擦掉眼泪。He shook his head and wiped his tears with a tissue.法官生气地摇摇头，朱克斯安静下来。The judge shook his head irritably and Juicks hushed.他抽了口烟斗，摇了摇头。He took a puff on his pipe and shook his head....