吸收池应装多少溶液为宜？两个吸收池吸收度相差多少可认为是配对的？应装至吸收池体积的4

（）铸铁因为其性能硬脆，难以加工，主要用做炼钢原料。

A.麻口铸铁

B.白口铸铁

C.灰口铸铁

D.球墨铸铁

对购物环境适应能力强，在购物中观察敏锐、反应敏捷，易于与营业员沟通的消费者的气质类型属于（）。

A.多血质

B.粘液质

C.胆汁质

D.抑郁质

Congress makes the laws in the United States. It has two parts, which are more or less equal in power. They are known as the House of Representatives and the Senate. The House of Representatives is larger than the Senate whose 100 members (two from each state) serve for six years. The 435 members of the House are elected every two years, and the number from each state is determined by the population of the state. For example, California, which has a large population, has 43 representatives, while the State of Nevada has only one.
The House and Senate are divided into small groups which take care of special matters such as education or foreign affairs. The most important work of Congress is often done in these groups, which are called subcommittees.

In the U.S. Congress, the House of Representatives and the Senate are______.
A. not equal. The House is more powerful
B. almost equal in power
C. not equal. The Senate is far more powerful
D. different. The House is more important

According to the Constitution of the United States, a senator must be at least 30 years old and he must have been a citizen of the United States for nine years at the time of his election. To be elected to the House a person must be 25 years old and must have been a United States citizen for seven years. At the present time, members of Congress include businessmen, farmers, teachers, and especially lawyers. In general, senators are better known than representatives because they are fewer in number and serve for a longer time. Many American presidents served in Congress before they became president.

选矿厂三车间胶带输送机允许采用的最大倾角为多少？

离子交换器进水盐类浓度越大，则离子的交换作用增强（）。