题目内容
词汇与结构When higher forces are required to generate sufficient elevator control to flare for landing, stabilizer trim is available to _________ the sustained control column force.
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词汇与结构If the ailerons or spoilers are _________, force applied to the Captain’s and the First Officer’s control wheels will identify which system, ailerons or spoilers, is usable.
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词汇与结构_________ from behind, the left vortex rotates clockwise and the right vortex rotates counter-clockwise.
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