肾虚头痛的主要特点是A．头痛晕沉 B．头痛绵绵 C．头脑空痛 D．头痛连项

现代设备管理的目标是（　　）。

A．技术管理

B．维修管理

C．日常管理

D．设备在寿命周期内经济性最好

目前世界上正在研究一些可替代的新型制冷技术，它们包括：1） ______，2） ______，3）______ ，4）______ ，5）______ 等。

Lemonade is a favorite summer drink. It is enjoyed at family meals, picnic, ball games, and many special parties. People like its light, lemony taste. They also like it because it keeps them from getting too thirsty. Do you drink it
Fresh lemonade can be made by cutting a lemon in half and squeezing the juice into a cup. After the seeds are taken out, sugar and water are mixed in. One cup of lemon juice, One cup of sugar, and two quarts of water stirred together make good lemonade.
There are even easier ways to get lemonade. One way is to buy lemonade powder. Then add the right amount of water. Another way is to buy cans of frozen lemonade and mix it with water. The easiest way of all is to buy and open a can of lemonade that is ready to drink, just like a can of juice.
Lemonade is good for people. It has vitamin C. It keeps the body cool in summer. When served hot it can help a bad cold or a sore throat.
Lemonade is not a new drink. It has been around for a long time. Some say it came from China. Others think it probably came from England or France. More than four hundred years ago an English doctor wrote about the good that lemonade can do for people.

In order to make good lemonade with one cup of lemon juice, we should add to it ______.

A．two spoons of sugar and two quarts of water

B．one cup of sugar and two quarts of water

C．one cup of sugar and one quart of water

D．one spoon of sugar and one quart of water

对比土壤粒组、土壤质地、土壤结构的特点。

西方经济学产生与形成时期的代表流派是（）.

A.重农主义

B.重商主义

C.古典经济学

D.庸俗经济学