A、X+Y服从正态分布
B、X<sup>2</sup>+Y<sup>2</sup> 服从<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/15111465467675dfae1b3e1d5409b99e49e901e09af80image3.png"><sup>2</sup>分布
C、X<sup>2</sup>和Y<sup>2</sup>都服从<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/151114654693774fd19ee3309471dac0bd4c3ceb7b17cimage3.png"><sup>2</sup>分布
D、X<sup>2</sup>/Y<sup>2</sup>服从F分布.
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