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单选题
1042. 除非在平稳的空气中,否则不要超过这个速度或马赫数,而且要小心
A
Do not go beyond this speed or Mach number besides in steady air, and then be careful.
B
Do not increase by this speed or Mach number unless in steady air, and be careful.
C
Do not exceed this speed or Mach Number except in smooth air and then only with caution.
答案解析
正确答案：C
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