炉衬的侵蚀过程大致按照“()”的机理循环往复地进行的。A.氧化脱碳-侵蚀-冲刷 B.

题型:单项选择题

问题:

炉衬的侵蚀过程大致按照“()”的机理循环往复地进行的。

A.氧化脱碳-侵蚀-冲刷

B.侵蚀-冲刷-氧化脱碳

C.冲刷-氧化脱碳-侵蚀

考点:炼钢工转炉炼钢工考试转炉炼钢工考试题库
题型:单项选择题

阅读理解。

     Dereck Joubert and his wife, Beverly, have made many films about wild animals in Africa. Their films

and photographs are very popular and one of the photographs has been on the front cover of a National

Geographic magazine.   

     A working day foe Dereck and Beverly starts very early-at 4:30 in the morning! That's when they get up

and start filming. And it's a long day-they often work until 8:30 in the evening. In the winter it's very cold

and in the summer it can be 40℃. Dereck always does the filming-Beverly never does that, and she doesn't

write. But Dereck never takes photographs or records the sound. They work very well as a team, and they

both believe we should shoot animals with cameras-not with guns!   

     When they have finished filming and taking photographs for the day, they have dinner and Dereck usually

writes while Beverly looks at her photographs. At night, they usually sleep in a small tent, but they sometimes

sleep in the Land Cruiser-when you're very close to wild animals, it's sometimes safer to sleep in the car.   

     Dereck and Beverly have also traveled around the world and given talks about their work. Dereck says

that animals are not just something to look at-they play an important role. Beverly thinks the wild animals

can teach us a lot about ourselves.

1. Dereck and Beverly start working ______.   

A. at 4:30 in the morning

B. at 4:30 in the afternoon

C. at 8:30 in the morning

D. at 8:30 in the evening

2. Dereck and Beverly usually sleep ______ at night.

A. in a car

B. in a tent

C. in a house

D. in a hotel

3. Beverly thinks the wild animals ______.   

A. are something to look at

B. are very popular   

C. play an unimportant role

D. can teach us a lot

题型:单项选择题

杜鹃花与杜鹃鸟相比,缺少的结构层次是(  )

A.细胞

B.组织

C.器官

D.系统

题型:单项选择题

同名的阳经与阳经的循行交接部位是( )

A.腹中

B.心中

C.肘膝部

D.胸中

E.头面部

题型:单项选择题

建国以来,我国农业经历了曲折的发展过程。阅读下列材料,回答问题:

材料一  建国初期我国农业发展情况

年份粮食总产量(万吨)花总产量(万吨)比上一年增长(%)上缴农业税(亿元)
粮食棉花
195013 21369.216.755.919.1
195114 369103.18.74921.69
195216 390130.414.126.527.03
材料二

材料三       

 

图1:1978年安徽省凤阳县小岗生产队

部分农民签订的一份包干合同书

请回答:

(1)结合材料一和所学知识分析,建国初期我国农业发展的状况及其原因。

(2)结合材料二和所学知识分析这一时期我国粮食产量的变化情况,并分析原因。

(3)材料三图1预示着当时农村即将实行什么重大变革?简要说明这一变革实行的历史意义。

(4)材料三中图2反映了城市经济体制改革中什么现象的变化?它表明所有制转变的的方向是什么?

题型:单项选择题

土壤结构性

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