PGO优化属于（）

安川变频器上操作器显示PGO意思是()。

此题为判断题(对，错)。

A.delete

B.delete_all

C.delete_one

D.delete_many

A．主回路过电压

B．主回路低电压

C．旋转编码器无反馈信号

D．电梯超速速度

已知25℃时,HgO(s)的Δ_rG=-58.5kJ·mol^-1,电池(Pt)H₂(p^θ)|KOH(aq)|HgO(s)-Hg(l)的E^θ=0.926V,水的离子积K=10^-14.求OH^-的标准摩尔生成吉布斯自由能Δ_rG;

A.$gt

B.$lt

C.$eq$$ne

A.$gt

B.$lt

C.$eq$$ne

10th August, 2004

Dear Sirs,

Headquartered in Chicago, Illinois, PMC Company is a major producer of technically advanced machinery and chemicals for industry and agriculture.

With a history dating back to 1884, PMC has grown to become one of the 100 largest industrial companies in the United States, with 2000's sales in excess 超过)of $2 billion.All over the world, PMC has about 41,600 employees at 129 factories in 32 states, such as New York state, North Carolina,Pennsylvania, Virginia, etc.and 15 foreign countries.

We believe PMC to be one of the leaders of the packaging industry both in the U.S.and abroad.Through our own research, development and engineering efforts, we believe we are able to exchange views on and discuss the latest technical aspects of the industry.

PMC’s packaging expertise (专长 )is mainly in the following areas:

— Packaging and paper box making machinery

— Wrapping machines for varying uses

Faithfully yours,

General Manager

PMC Co.Ltd.

1.The company wants to sell().

A.industrial products

B.agricultural products

C.technical services

D.machinery and chemicals

2.Where is the Head Office of the company?

A.In New York state.

B.In North Carolina.

C.In Chicago, Illinois.

D.In Pennsylvania.

3.When did the company’s annual sales exceed $2 billion?

A.In the year of 1884.

B.In the year of 2000.

C.In the year of 2004.

D.In the year of 2002.

4.The company thinks().

A.it is one of the 15 largest companies in the world

B.it develops its relationship with China only for its own benefit

C.it plays a leading role in the world's packaging industry

D.it should open some new companies abroad

5.The letter is written to().

A.its customers in the States and abroad

B.its headquarters

C.its customers abroad

D.its employees in the 32 states and 15 foreign countries

In the Congo, fire detectors will be put in trees primarily to detect forest fires.