mach no meaning in English

我已飞最大速度

Abstract : the flow field mesurement and visualization of the reduced sp ace shuttle model are introduced briefly . that includes the vortex field mesureme nt 、 body pressure distribution mesurement and oil flow visualization . the testing mach nos and angles of attack are 0 . 4 , 0 . 6 , 0 . 8 , 1 . 5 , = 0 ？
文摘:叙述航天飞机简化模型流场测量与观察，进行了旋涡场测量，机身压力分布测量和组合体的油流观察。