“中国天眼” 射电望远镜的反射面的形状为球冠(球冠是球面被平面所截后剩下的曲面,截得的圆面为底, 垂直于圆面的直径被截得的部分为高, 球冠面积 S=2πRh,

“中国天眼” 射电望远镜的反射面的形状为球冠(球冠是球面被平面所截后剩下的曲面,截得的圆面为底, 垂直于圆面的直径被截得的部分为高, 球冠面积 S=2πRh, 其中 R 为球的半径, h 为球冠的高)

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The best way of ________ the problem is by asking the teacher for help.

The best way of ________ the problem is by asking the teacher for help.

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Finally both sides have reached an agreement, but the details later.

Finally both sides have reached an agreement, but the details later.

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随机变量 X的分布列为,则 P(|X|=1) 等于()

随机变量 X的分布列为,则 P(|X|=1) 等于()

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