直线回归分析中,反映回归平方和在总离均差平方和中所占比重的统计量是()
A.复相关系数
B.偏相关系数
C.偏回归系数
D.回归均方
E.决定系数
参考答案:E
—Please read every sentence carefully. you are, mistakes you’ll make.
—Thank you for your advice.
A.The more carefully; the fewer
B.The more careful; the less
C.The more carefully; the less
D.The more careful; the fewer
胡黄连主要含()
A.生物碱
B.皂苷
C.木脂素类
D.蒽醌类
E.环烯醚萜苷类