题目：
（）类空域为进近管制空域，其垂直范围通常在6000米（含）以下至最低高度层以上；水平范围通常为半径50千米或走廊进出口以内的除塔台管制范围以外的空间。
A.C
B.D
C.A
D.B
答案：
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参考答案：二次下电
（）类空域为进近管制空域，其垂直范围通常在6000米（含）以下至最低高度层以上；水平
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