不挂科搜题免费

问题:

当使用指示空速时,指定速度通常为()千米/小时的倍数,当使用马赫数时,为()马赫数的倍数。

选项

  • 10,0.01

  • 10,0.02

  • 20,0.02

  • 20,0.01

  • 答案:

    D.20,0.01