问题描述:
[单选]
B789机型在严重颠簸情况下的穿越速度是多少 What is the turbulence crossing speed of the B789 under severe turbulence?
A.A 低于25,000英尺时290KIAS;25,000英尺及以上时310KIAS/.84马赫(以较高者为准)290 KIAS below 25,000 ft; 310 KIAS/Mach .84 at 25,000 ft and above (whichever is higher)
B.B 低于25,000英尺时290KIAS;25,000英尺及以上时310KIAS/.84马赫(以较低者为准)290 KIAS below 25,000 ft; 310 KIAS/Mach .84 at 25,000 ft and above (whichever is lower )
C.C 低于20,000英尺时290KIAS;20,000英尺及以上时310KIAS/.84马赫(以较低者为准)290 KIAS below 20,000 ft; 310 KIAS/Mach .84 at 20,000 ft and above (whichever is lower)
D.D低于25,000英尺时290KIAS;25,000英尺及以上时320KIAS/.82马赫(以较低者为准)290 KIAS below 25,000 ft; 320 KIAS/Mach .82 at 25,000 ft and above (whichever is lower)
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