下列有关测定孔位置的说法正确的是( )。 A.将风管截面划分为若干个相等的小截面,

题型:多项选择题

问题:

下列有关测定孔位置的说法正确的是( )。

A.将风管截面划分为若干个相等的小截面,其面积不得大于0.1m2

B.所选的截面应是平直管段

C.网形截面测点的位置应在互相垂直的同一截面上设置三点

D.在测定圆形风管内平均风速时,应根据管径的大小,将截面分成若干个面积相等的同心圆环,每个圆环测量四个点

E.测定截面距前面局部阻力的距离要比它距后面局部阻力的距离长一些

考点:质量员暖通质量员通风与空调工程施工质量验收
题型:多项选择题

关于有效碰撞理论,下列说法正确的是(  )

A.活化分子间所发生的所有碰撞为有效碰撞

B.增大反应物浓度能够增大活化分子百分数,化学反应速率一定增大

C.升高温度,活化分子百分数增加,化学反应速率一定增大

D.增大压强,活化分子数一定增加,化学反应速率一定增大

题型:多项选择题

口服能引起碱血症的抗酸药物是()

A.氢氧化镁

B.碳酸钙

C.氧化镁

D.氢氧化铝

E.碳酸氢钠

题型:多项选择题

女性,20岁,持续高热1周,胸、腹部出现皮疹,经检查确诊为伤寒,其皮疹特征为()。

A.红色不凸出皮肤

B.压之不褪色

C.呈红色出血点

D.直径>2cm

E.呈粉红色丘疹

题型:多项选择题

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