最早记载感冒之病名的是 A．《严氏济生方》 B．《仁斋直指方》 C．《肘后备急方》

下列有关溶液说法中，正确的是（　　）

A．不饱和溶液转化为饱和溶液，溶液中溶质的质量分数一定增大

B．将一定量某物质的饱和溶液降温析出晶体后，所得溶液中的溶质质量分数一定减小

C．将5g某物质完全溶解于95g水中，所得溶液中溶质质量分数不一定是5%

D．浓溶液加水稀释后溶质质量分数不一定减小

试管凝集法检测军团菌时，抗体的阳性标准为滴度（）

A.≥1：40

B.≥1：80

C.≥1：160

D.≥1：320

E.≥1：640

简述机关的构成要素。

以下说法中正确的是( )。

A．法律关系主体的变更，必然导致内容的变更

B．法律关系主体的变更，必然导致客体的变更

C．法律关系内容的变更，必然导致主体的变更

D．法律关系内容的变更，必然导致客体的变更

"High tech" and "state of the art" are two expressions that describe very modern technology. High tech is just a shorter way of saying high technology. And high technology describes any invention, system of device that uses the newest ideas or discoveries of science and engineering.

What is high tech A computer is high tech. So is a communications satellite. A modern manufacturing system is surely high tech.

High tech became a popular expression in the United States during the early 1980’s. Because of improvements in technology, people could buy many new kinds of products in American stores, such as home computers, microwave ovens, etc.

"State of the art" is something that is as modern as possible. It is a product that is based on the very latest methods and techn01ogy. Something that is "state of the art" is the newest possible design or product of a business or industry. A state of the art television set, for example, uses the most modern electronic design and parts. It is the best that one can buy.

"State of the art" is not a new expression. Engineers have used it for years, to describe the best and most modern way of doing something.

Millions of Americans began to use the expression in the late 1970’s. The reason was the computer revolution. Every computer company claimed that its computers were "state of the art".

Computer technology changed so fast that a state of the art computer today might be old tomorrow. The expression "state of the art" became as common and popular as computers themselves. Now all kinds of products are said to be "state of the art".

All the following examples are high tech EXCEPT（）

A. a microwave oven

B. a home computer

C. a hand pump

D. a satellite