硅整流直流弧焊机是利用（），将（）变为直流电的。

For many years , Hawaii has been a magic name to people who like to travel. People on both sides of the Pacific Ocean, in Japan and in America, dream of seeing these beautiful islands in the middle of ocean. Their dreams always include at least on scene of a sunset over the ocean. In the tropical （热带的）lands, the sun drops like a ball of golden fire into the sea. And it drops so quickly that you can almost see it move. The sun leaves behind a glow that lights the skies in the quiet water.

People often have a quiet, peaceful time—perfect for a leisurely walk along the water. This scene is not too different from the dramatic beauty that greeted the first strangers to these islands centuries ago. They were Polynesia people who came from Tahiti in canoes that much bigger than small boats.

They found the beautiful white sand beaches and the waving palm trees, but there were no grand hotels like the ones we see nowadays. The first people came to Hawaii nearly two thousand years ago, but skyscraper hotels were only built in the last 30 years. Now jet airplanes make it possible to fly to Hawaii for a weekend from Tokyo or San Francisco or Los Angeles.

Wherever people come from, they really want to see the original（原始的，最初的） beauty of Hawaii. They want to see the lovely beaches and the mountains called Diamond Head which is almost hidden by the tall hotels.

小题1:Hawaii is a name __________.

A．given by people who like to travel

B．attracting a lot of travelers

C．with an interesting story behind it

D．talked about by both the Japanese and Americans.小题2:The most magic thing on these beautiful islands is

A．the tropical plants

B．a leisurely walk along the beach

C．the sunset

D．the quiet water小题3:Which of the following does not belong to “the original beauty of Hawaii”

A．White sand beaches

B．Waving palm trees

C．Tall hotels

D．The Diamond Head Mountain小题4:The meaning of the underlined word is ________

A．very beautiful

B．expensive and comfortable building

C．low and pleasant building

D．very tall building小题5:The last paragraph suggests _________.

A．The scenery nowadays is different from the original beauty

B．It is not quite easy to see the original beauty, because some of the scenery is almost hidden by tall hotels

C．The scenery nowadays is unchanged

D．It is difficult to see the original beauty because things have completely changed in the last twenty-five years

X线管的焦点不包括（）

A.实际焦点

B.有效焦点

C.大焦点

D.小焦点

E.虚焦点

对口援疆工程即国家以灾区重建的模式来扶持新疆，要求全国19省市对口支援新疆。各省市需建立起人才、技术、管理、资金等方面援助新疆的有效机制，优先保障和改善民生，并且要下大力气帮助新疆各族群众解决就业、教育、住房等基本问题，同时支持新疆相关特色产业的发展,提高新疆自身的“造血”功能。对口援疆工程充分体现了

①民族区域自治制度有利于巩固平等、团结、互助、和谐的民族关系

②离开国家和各省市的支持，新疆就不能取得发展

③我国坚持民族团结和各民族共同繁荣原则

④我国是人民当家作主的国家

A．①③

B．①②

C．②③

D．③④

十六、十七、十八世纪所出现的天赋 * * 的学说是（）学说复活的结果，尽管有着许多重要的修正。

A、怀疑派

B、斯多葛派

C、伊壁鸠鲁派