粉尘在呼吸道的阻留与以下哪种因素有关( )
A.粉尘粒子的直径
B.粉尘粒子的比重
C.粉尘粒子的形状
D.粉尘粒子荷电性
参考答案:A,B,C,D
解析: 属识记内容。
下列关于收益法求取净收益的说法,错误的是( )
A.净收益包括有形收益和无形收益
B.运营费用包含房地产折旧额及其设备的折旧费
C.通常只有客观收益才能作为估价依据
D.应同时给出较乐观、较保守和最可能的三种估计值
Mum asked Lucy ________.[ ]
A. if could she get some tea for her
B. whether she get some tea for her
C. if she could get some tea for her
D. whether she can get some tea for her