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单选题
当用千斤顶顶升飞机时，保持重心在限制范围内。
A
When you lift the aircraft on racks, keep the center of the aircraft between these limits.
B
When you lift the aircraft on jacks, keep the center of gravity between these limits.
C
When you lift the aircraft on jacks, the gravity of the aircraft shall be limited.
答案解析
正确答案：B
相关知识点：
千斤顶顶飞机，重心要受限
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