在大多数轧钢厂，钢板主要采用（）矫直机进行矫直。

阅读理解。

     Many years before the United States was founded (建立), Americans had already invented barbecues.

But the first barbecues, in fact,were the invention of the Taine Indians of Haiti, who dried their meat on raised

frames (架子) of sticks over fires. Spanish explorers spelled the Taine word as barbecue, and as time passed,

English settlers along the Atlantic coast had their own barbecues.

     One summer day in 1773, Benjamin Lynda, a citizen of Massachusetts, wrote in his diary, "Fair and hot;

Browne; hack overset." That is, on a bright and hot day he went to the Brownes to attend a barbecue, and his

carriage (马车) fell over. It shows that the barbecue had its social occasion by that time. Large animals would

be roasted whole on frames over hot fires, and neighbors would be invited to dinner.

     In later centuries, as settlers moved to the west, the barbecue went along with it, reaching an especially

large size in Texas, where a pit (坑) for fuels (燃料) such as tree branches might be over ten feet deep. Today,

the barbecue grills (烧烤架) which are fueled by charcoal (木炭) or electricity are likely to be small and easy to

move, and can cook only parts of an animal at a time, but people still have barbecues out of doors and always

invite their neighbors or friends over.

1. Who invented the barbecues first in history?

A. American people.

B. Taine Indians.

C. Spanish explorers.

D. English settlers.

2. The second paragraph mainly tells us that the barbecue ___________.

A. is only held on a hot sunny day

B. welcomes people who keep diaries

C. is held both indoors and outdoors

D. has its social occasion for over 200 years

3. The underlined expression "social occasion" can be best translated into ___________.

A. 社交功能

B. 社会福利

C. 社会地位

D. 社会背景

4. The following are all the barbecue ways EXCEPT ___________.

A. drying meat on raised frames of sticks over fires

B. roasting a whole animal over a pit full of burning tree branches

C. cooking parts of animals over fires on grills fueled by charcoal

D. heating meat in the bright and hot daylight

            there any fish in the river?[ ]

A. Be                   

B. Are                

C. Is

在探究欧姆定律里电流与电阻的关系实验中（如图）

（1）闭合开关前，滑动变阻器应处于_____，目的是____ ．

（2）小敏同学按甲图的电路原理图连接了乙图实物电路，其中有两个元件连接错误．它们分别是_____和_____（只需填写连错的元件）．

（3）重新连接电路后，用开关S进行试触，如果电流表指针向左偏转，说明电流表_____；如果电流表指针向右偏转超过刻度盘，应换用_____量程．

（4）正确连接电路后，测出R₁=5Ω、两端电压为3V时的电流，并记录相关数据．然后将电阻R₁由5Ω换成10Ω，此时他应将滑动变阻器触头P向_____端滑动（A或B），在触头P滑动的过程中他的眼睛应始终注视着_____（电压表、电流表），使电阻R₁两端的电压为_____V时为止．此时，电路中的电流将_____（填“变大”或“变小”）．此实验是采用了_____ 法进行探究的．

某学生提供的实验数据如下，其中肯定错误的是[ ]

①用100毫升的量筒量取67.60 mL的液体　

②用托盘天平称取22.5 g KCl　

③酸碱中和滴定时，消耗0.100 0 mol/L的盐酸23.25 mL　

④用广泛pH试纸测得某溶液的pH＝4.4

A．①②  

B．②③

C．③④  

D．①④

患者，男性，56岁，患胃溃疡15年，近3个月复发，经8周内科药物治疗无效。

提示：该患者便隐血试验持续阳性提问：做哪项检查有助确诊？（）

A.胃镜+活检

B.钡透

C.腹部平片

D.胸腹联透

E.胃液分析