Academy;
of;
Mathematics;
and;
Systems;
Science;
Chinese;
Sciences;
Beijing;
100190;
China;
GraduateSchool;
the;
Department;
Management;
City;
University;
Hong;
Kong;
Tat;
Chee;
Avenue;
Kowloon;
China.;
原油价格; Granger因果关系; 非线性关系; 滚动窗口; 检验方法; 金融危机; 试验检测; 单向;