喷雾降尘的雾流参数有（）。
A.雾流直径
B.雾粒运动速度
C.雾粒密度
D.雾流含水量
E.雾流粒径
参考答案：A, B, C, D
同一类传染病病人住同一病房，床距应保持在（）
A.1m以上
B.0.8m以上
C.1.5m以上
D.2m以上
E.2.5m以上
Miss Jones music at Bardon School for five years when she was abroad and now she has been appointed _______ of our school．
A．had taught; president
B．has taught; the president
C．taught; president
D．has been teaching; the president
