在板框过滤机中进行恒压过滤,滤饼不可压缩,介质阻力不计。过滤时间为 t 时,滤液量为 V ,过滤速度为 u. 若过滤压差变为原来的 2 倍,过滤时间为 t 时,过滤速度为() prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【单选题】Section A Directions: In this section, you will hear three conversations. At the end of each conversation, you will hear one question. Both the conversations and the questions will be spoken only once...
A.
He thinks the policy is complicated.
B.
It is exactly the same as the lab he went to before.