（）可以用作种肥。A．硫酸铵 B．碳酸氢铵 C．硝酸铵 D．过磷酸钙

知识学习的第一个阶段是（）

A．领会

B．选择

C．保持

D．应用

写出下列图中所蕴含的物理知识。

（1）图1：奥斯特实验说明通电导体周围存在着                           。

（2）图2： 搓手取暖说明做功可以改变物体的                              。

（3）图3：扬声器发声时小纸片上下跳动说明发声的物体在                            。

用总需求—总供给模型可以直接决定（）、价格水平

Woman: I can’t believe Karen is late for such an important occasion as a job interview. I reminded her time and again yesterday.
Man: You should have known her better by now. Everything you tell her goes in one ear and out the other.
Question: What does the man imply().

A. Karen is very forgetful.

B. He knows Karen better now.

C. Karen is sure to pass the interview.

D. The woman should have reminded Karen earlier.

计算题：将单位吸水量ω＝0.044L/min.m.m换算成透水率q的吕荣（Lu）值。