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单选题
在你移动副翼之前，告诉所有人离开机翼。
A
A.Before you move the spoilers, tell all persons to get off the wings.
B
B.Before telling all persons to get off the wings, you move the ailerons.
C
C.Before you move the ailerons, tell all persons to get off the wings.
答案解析
正确答案：C
相关知识点：
动副翼前离机翼
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