演讲稿不应留有伸缩的余地，而应完全固定下来，以便演讲顺利进行。

If the specific purpose of your informative speech is t...

单项选择题If the specific purpose of your informative speech is to recount the history of an event, you will usually arrange the speech in chronological order. A. 对 B. 错

货币发行必须遵循的原则包括( )。A．垄断发行原则 B．信用保证原则 C．弹性发行原则 D．流动发行原则

多项选择题货币发行必须遵循的原则包括( )。

4.A membrane-affiliated protein is isolated by detergen...

单项选择题4.A membrane-affiliated protein is isolated by detergent extraction, and found to be amphipathic and lacking any nonprotein components. To which class of membrane proteins does it belong? （ ）
A、Integral proteins
B、Peripheral proteins
C、Lipid-anchored proteins
D、Phospholipid
E、None of the above