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伽顿板实验演示了正态分布规律，它们是___ Gatton-plate experiment demonstrates the normal distribution. They are___
A．两头小，中间大； Small at the ends, large in the middle;
B．两头大，中间小； The ends are large, the middle is small;
C．两头、中间小； Small at both ends and in the middle;
D．中间大； Big at both ends and in the middle;
参考答案和解析
B
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