处理阀门开不动故障的措施包括()。A、调整填料的松紧适度 B、娇直阀杆,修理螺纹并除

题型:多项选择题

问题:

处理阀门开不动故障的措施包括()。

A、调整填料的松紧适度

B、娇直阀杆,修理螺纹并除垢

C、边敲阀体法兰,边旋手轮

D、蒸汽适度加热阀门

考点:汽油加氢装置操作工考试高级汽油加氢装置操作工考试高级汽油加氢装置操作工考试题库
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(2012·资阳)(4分)化学在工农业生产中的应用较为广泛。

(1)合理使用氮肥、磷肥、钾肥是农业增产的重要手段,下列属于复合肥的是(填序号)      

①尿素[CO(NH2)2]              ②硫酸钾[K2SO4

③磷酸二氢铵[NH4H2PO4]   ④硝酸铵[NH4NO3

(2)不同农作物的生长适应酸碱性不同的土壤。经测定某土壤的pH为5.6,该土壤为(填“酸”或“碱”)   性土壤。

(3)可用适量的稀盐酸除去锅炉里的水垢[主要成分为CaCO3、Mg(OH)2],用化学方程式表示其反应之一:                       ;稀盐酸选用适量而不是过量,是因为                 

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Ray Travers sat back at the large desk, and looked around his plush(豪华的)office.  He was tired

Ray's eyes stopped at a painting on the wall.  It was a gift given by an old friend,Bull,as a farewell gift when he left his hometown  He recalled the life spent in that small town; pleasant times.  The many hours he spent talking to his good friend, and the tales he was told about hunting in the Africa of old.

Memories flowed back more than ten years;  he remembered how he enjoyed hearing about the wonderful hunting,and how he wished he could have shared those times.

Ray opened his desk drawer and brought out a wooden box. He opened the lid and exposed a work of art,a hand-made hunting knife.  This was a gift from Bull,given to Ray more than 20 years ago.  It was one of the first knives Bull had made, and Ray had called it "Zambezi",the river where Bull had been so many times.

He closed the box and sat upright at his desk;he was driving himself hard, and deserved a break.  Things were going well with the business,everything running smoothly.  He could afford a week off!

He went back home.  A week in the hometown would be like going back in history. "Man, it's going to be good,”Ray said aloud,as he turned onto the highway and watched the city lights fast disappearing,as he looked in the rearview  mirror.  The powerful car going  its way through  the night,  headlights  piercing(穿透)the darkness.  Memories danced through the man's mind.  Memories of good times,when he knew what it was to relax, to talk,and to really visit.

Slowly entering town he looked around.  Ray sat in his car,  looking at the old building,smiling.  Inside it was almost as though it was the same people as 15 years ago.

小题1:We learn from the text that __________.

A. Ray's old friend, Bull, is a painting artist

B. Ray visited Africa together with Bull many times

C. Ray and Bull often went hunting together

D. Ray left his hometown more than ten years ago小题2:Which of the following  words can best describe Ray's feeling about going back    home?

A. Worried

B. Excited

C. Calm

D. Nervous小题3:It can be inferred from the text that________.

A. Ray was a successful businessman

B. Ray had a hard time in the hometown

C. Ray's hometown was a small remote mountain village

D. Ray was the first promising young man in the hometown小题4:What may the author talk about in the paragraph that follows the text?

A. Ray's childhood spent in his hometown.

B. Why Ray left his hometown alone.

C. The situation in Ray's hometown.

D. How Ray went into business.

题型:多项选择题

报表的数据源不包括( )。

A.视图

B.自由表

C.数据库表

D.文本文件

题型:多项选择题

队列研究中累积发病率计算适宜的条件是

A.研究人群数量较少

B.人口流动性较小

C.观察期较长

D.疾病发生频率较高

E.发病强度较大

题型:多项选择题

连铸对钢水的要求有严格的()。

A.时间管理

B.成分控制

C.温度控制

D.可浇性

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