题目内容

单因素方差分析的备择假设是

A. 各对比组样本均数相等
B. 各对比组总体均数相等
C. 至少有两个对比组总体均数相等
D. 各对比组总体均数不等
E. 各对比组总体均数不全相等

查看答案

搜索结果不匹配？点我反馈

更多问题

正常龈沟的深度是

A. ＜0.5mm
B. 0.5～2.0mm
C. 0.5～3.0mm D．1.5～2.5mm
D. 3.0～4.0mm

下列对心交感神经的叙述，错误的是

A. 节后纤维释放的递质是去甲肾上腺素
B. 可导致心率加快
C. 可导致房室交界的传导加快
D. 可导致心房和心室肌收缩力加强
E. 肾上腺素受体可阻断其作用

Benjamin Franklin, tactless in his youth, became so diplomatic, so ______ at handling people that he was made American Ambassador to France.

A. adroit
B. shrewd
C. considerate
D. foxy

My computer isn't working. It______.

A) need repairing
B) needs repairing
C) need to repair
D) need to be repaired