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单选题
The RVR value represents （ ） ．
A
the slant range distance the pilot can see down the runway while crossing the threshold on glide slope
B
the horizontal distance a pilot should see down the runway from the approach end of the runway
C
the slant visual range a pilot should see down the final approach and during landing
D
the horizontal distance a pilot should see down the final approach and during landing
答案解析
正确答案：D
