教科书的编排通常采用__________和螺旋式两种形式。
参考答案:直线式
设来自正态总体X~N(μ,1.52)的样本值:49.7,50.6,51.8,52.4,48.8,51.1,51.2,51.0,51.5。则μ的置信度为0.95的置信区间为()。
A.[49.92,51.88]
B.[49.7,51.88]
C.[50.6,51.88]
D.[49.92,51.1]
患儿,2岁。发热咳嗽3天。症见发热,无汗,呛咳不爽,呼吸气急,痰声重浊,咽不红,舌淡红,苔薄白,指纹浮红。其证候是()
A.风寒闭肺
B.风热闭肺
C.痰热闭肺
D.肺脾气虚
E.阴虚肺热