lesson 20 听力理解：Question: What is the touchdown RVR?
A. 650
B. 700
C. 600
D. 550
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lesson 20 听力理解：Question: What is the reason for going around?
A. Wind shear
B. Runway not in sight
C. Runway incursion
D. Overshooting
lesson 20 听力理解
A. Touchdown
B. Mid-point
C. Stop-end
D. Roll-out
lesson 20 听力理解
A. 800-400 feet
B. 600-200 feet
C. 400-200 feet
D. 800-200 feet
lesson 20 听力理解
A. Sandstorm
B. Heavy fog
C. Thunderstorm
D. Heavy rain
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