行×列表的自由度是（）
A.行数-1
B.列数-1
C.行数×列数
D.行数-1）×（列数-1）
E.样本含量-1
参考答案：D
低压容器（）的压力范围在（）之间。中压容器（）的压力范围在（）之间。
As ordinary people, scientists are by no means more honest or ______ than other people, but as scientist, they attach special value to honest while they are in their working sphere.
A．ethical
B．ethnic
C．aesthetic
D．esthetic
