多项选择题

相关系数的性质有
A、r的取值范围介于-1和1之间
B、r的正负号表示双变量数列之间的相关方向
C、r=1时表示完全正相关
D、r取值的大小表示相关的强弱程度

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单项选择题

Which of the following statements is correct?
A、Internalizing a negative externality will cause an industry to decrease the quantity it supplies to the market and decrease the price of the good produced.
B、Internalizing a negative externality will cause an industry to decrease the quantity it supplies to the market and increase the price of the good produced.
C、Internalizing a negative externality will cause an industry to increase the quantity it supplies to the market and decrease the price of the good produced.
D、Internalizing a negative externality will cause an industry to increase the quantity it supplies to the market and increase the price of the good produced.

单项选择题

常用运动状态的特点是 A.
不规则运动状态 B.
规则运动状态 C.
不常见的动态