被害黑数

确定尿中有无原浆型菌株应做（）

A.取新鲜尿作培养

B.导尿培养

C.冲洗膀胱后尿培养

D.用高渗培养基培养

E.作厌氧培养

In some western countries, it is believed that a person is in great danger of illness when he sneezes (打喷嚏). Therefore, people will express wishes when they hear others sneeze. The person who sneezed would apologize for that. Which situation fits western custom?

在下列溶液中分别滴加NaOH溶液，会产生蓝色沉淀的是（　　）

A．FeCl₂

B．CuSO₄

C．MgCl₂

D．KNO₃

高压配电一般采用8kV，但如6kV用电设备的总容量较大，技术经济上合理时，则可采用6kV。( )

并流干燥流程适宜何种物料？