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单选题
This paragraph describes the procedures to calculate weight and moment for various phases of a planned flight and to ensure that the center of gravity is within approved limits.
A
本段描述了不同飞行阶段重量和力矩的计算程序，以及确保重心处于经批准范围内的程序。
B
本段描述了为计划飞行的各个阶段计算重量和力矩的程序，以此确保重心处于经批准的范围内。
C
本段描述了为计划飞行的各个阶段计算重量和配平的程序以及确保重力的中心点在批准范围内的程序。
答案解析
正确答案：B
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