单项选择题

满族过年的墙画剪纸是什么颜色？（）

A．彩色
B．黑白

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单项选择题

The police could not prove he had been involved in the crime, so they had to ________ him. A. Do what you are told. B. Do what is right for all. C. Do what is right for you. D. Do what you don’t like.

问答题

应用恒压过滤速率方程进行工程计算时，需要知道过滤介质的（）（用文字填写，不要用字母）与K，对可压缩性滤饼还要知道相关系数s、r0等参数。

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