对于局部腐蚀的发生下列说法中错误的是（）。A.材料应有不均匀性 B.溶液存在不均匀性

工程项目总控的核心是( )。

A．进度控制

B．质量控制

C．费用控制

D．合同控制

Fidenzio Salvatori is determined that the city of Toronto will have an outdoor marketplace for merchants from its immigrant community, complete with dancing and other forms of amusement form their native countries. “Toronto is truly multicultural (多元文化的)，” he said in a newspaper interview. “It’s a city from many places, and multicultural marketplace will help Torontonians to understand and appreciate the rich variety of cultural groups in our city.”    

Salvatori, aged 23, will soon complete his studies at the University of Toronto. He was eleven years old when he came to Canada from Italy with his parents. “Most of Toronto’s immigrants are from lands where the marketplace has always been part of daily life,” he said.

Salvatori has been interested in getting an open-air market for Toronto for the last three years. This year, with the help of two fellow students, he prepared a proposal on the subject and presented it to the city’s Executive committee, asking for their support. The proposal pointed out Toronto’s rich variety of national groups, “whose customs include market shopping.”

Under a Canadian government program for multiculturalism, the three students have received two thousand dollars with which they will do a study to find out whether Toronto’s immigrant businessmen would support an open-air market. They hope the merchants will support the plan strongly. “A study done earlier this year showed that 90 percent of shoppers would be in favor of it,” Salvatori said. “At first it would be an experiment. But we think it will prove to be good business for the merchants, as well as tourist attraction.”

小题1:What is Fidenzio Salvatori’s purpose of having an outdoor marketplace for Toronto?

A．To provide different forms of amusement.

B．To keep the cultural variety of the city.

C．To inspire its immigrant community.

D．To satisfy its immigrant merchants.小题2:Fidenzio Salvatori, with two other students, has got two thousand dollars from the government ______.

A．to make an experiment

B．to perform a research

C．to start a marketplace

D．to operate a business小题3:According to Salvatori, the marketplace may also help to improve Toronto’s ______.

A．market management

B．travel industry

C．community service

D．city planning小题4:It can be inferred from the text that the Canadian government supports ______.

A．the protection of different cultures

B．the plan of an open-air market

C．the request of merchants

D．the attitude of shoppers

卫星接收天线收到的电磁波有（）、右旋圆极化、垂直线和水平线极化四种的极化方式。

双缩脲反应可用来测定蛋白质，其主要成分含有（）。

A.Mn²⁺

B.Cu²⁺

C.Mg²⁺

D.Zn²⁺

E.Ca²⁺