为了除去蛋白质溶液中混有的少量食盐，应采取的方法是 A．渗_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

为了除去蛋白质溶液中混有的少量食盐，应采取的方法是

A．渗析

B．过滤

C．电泳

D．丁达尔效应

答案

答案：A

单项选择题

下列不属于财政政策特征的是（）

A.法制性

B.稳定性

C.概括性

D.系统性

单项选择题

Questions 14-23

·Look at the ten statements for this part.
·You will hear a story about communication through time.
·Decide whetheryou think each statement is right(R) wrong(W) or not mentioned(NM).
·You will listen to it twice.
·Markyour answers on the Answer Sheet.

In the U.S., it is customary to telephone friends and acquaintances during the early hours of the morning.

A. Right

B. Wrong

C. Not Mentioned