在钻眼过程中，发现机具、钻杆异常应怎样处理？

抵押债券一般应以信托形式过户给独立的中介机构，在约定的条件下，中介机构代全体债权人行使对抵押债券的处置权。（）

加热固化型基托树脂热处理置于70～75℃水浴中恒温时间需要（）。

A.10分钟

B.30分钟

C.60分钟

D.90分钟

E.120分钟

在做托里拆利实验时，测得的大气压比真实值小，其原因可能是（　　）

A．玻璃管倾斜

B．玻璃管粗细不均匀

C．水银槽内的水银太多

D．玻璃管内混入少量空气

阅读理解。

     The engineer Camillo Oliver was 40 years old when he started the company in 1908.

     At his factory in Ivrea, he designed and produced the first Italian typewriter. Today the company's head

office is still in Ivrea, near Turin, but the company is much larger than it was in those days and there are

offices all around the world.

     By 1930 there was a staff of 700 and the company turned out 13,000 machines a year. Some went to

customers in Italy, but Olivetti exported more typewriter to other countries.

     Camillo's son, Adriano, started working for the company in 1924 and later he became the boss. He

introduced a standard speed for the production line and he employed technology and design specialists. The

company developed new and better typewriters and then calculators (计算机). In 1959 it produced the ELEA

computer in Italy.

     After Adriano died in 1960, the company had a period of financial problems. Other companies, especially

the Japanese, made faster progress in electronic technology than the ITalian company.

     In 1978, Carlo de Benedetti became the new boss. Olivetti increased its marking and service networks and

made agreements with other companies to design and produce more advanced office equipment. Soon it

became one of the world's leading companies in information technology and communications. There are now

five independent companies in the Olivetti group-one for personal computers, one for systems and services,

and two for telecommunications.

1. From the text we learn that _____. [ ]

A. by 1930 Olivetti produced 13,000 typewriters a year

B. Olivetti earned more in the 1960s than in the 1950s

C. some of Olivetti's 700 staff regularly visited customers in Italy

D. Olivetti set up offices in other countries from the very beginning

2. What was probably the direct result of Olivetti's falling behind in electronic technology? [ ]

A. Adriano's death.

B. A period of financial problems.

C. Its faster progress.

D. Its agreements with other companies.

3. What do we know about Olivetti?[ ]

A. It produced the best typewriter in the world.

B. It designed the world's first mainframe computer.

C. It exported more typewriters than other companies.

D. It has five independent companies with its head office in Ivrea.

4. The best title for the text would be _____. [ ]

A. The Origin of Olivetti

B. The Success of Olivetti

C. The History of Olivetti

D. The Production of Olivetti

建立对象的数学模型有什么意义？