管内砾石充填防砂施工,从充填方式上可分为()。A、常规低密度砾石充填和高密度砾石充填

题型:单项选择题

问题:

管内砾石充填防砂施工,从充填方式上可分为()。

A、常规低密度砾石充填和高密度砾石充填

B、反循环充填和正循环充填

C、一步法充填和二步法挤压充填

D、常规砾石充填和压裂砾石充填

考点:石油钻井工考试石油钻井工高级技师石油钻井工高级技师题库
题型:单项选择题

Once there was a king. He liked to write stories. He thought his stories were good, so he like to show them to people. As people were afraid of him, they all said his stories were very good. One day, the king showed some of his best stories to a famous writer. He wanted the writer to praise(赞美)these stories. But the writer said his stories were so bad that he should throw them into the fire. The king got very angry and sent him to prison(监狱). After some time, the king set him free and ordered him to come to his palace(宫殿). Again he showed some of his new Stories and asked what he thought of them. After reading them, the writer at once turned to the soldiers and said, "Take me back to the prison."

小题1:The king thought his stories were good so ____.

A. People liked them

B. he liked to show them to people

C. he only showed some to the famous write

小题2:The famous writer was thrown into prison because

A. he was afraid of the king's stories

B. he said the king's stories were very bad

C. he said he couldn’t write good stories for the king

小题3:People were afraid of the king because

A. the stories were interesting

B. they would be sent to prison

C the king wrote many stories

小题4:Again the king showed the writer some of his new stories because

A. he wanted to know what the writer thought of them

B. he wanted to be angry with the writer

C. he wanted to send the writer to prison

小题5:When we read the writer's last words, we can be sure that

A. the writer would write some good stories while in prison

B. the writer liked the new Stories'

C. the king's new Stories were no good at all.

题型:单项选择题

原材料甲在2009年的平均单价为20700元/吨,以2008年为基年的2009年实价为2500元/吨;原材料乙在2009年的平均单价为2160元/吨,以2008年为基年,2009年原材料乙的实价为()元/吨。

A.1960

B.2000

C.2100

D.1900

题型:单项选择题

某小组同学在协助老师整理化学试剂时,发现一瓶标签残缺的无色液体(如下图)(温馨提示:标签上的5%表示该混合物中主要成分所占的质量分数)。他们对此瓶无色液体是什么产生了兴趣,于是进行了如下探究。

(1)【大胆猜想】猜想一:水 猜想二:稀硫酸 猜想三:过氧化氢溶液 小组同学对标签又进行了仔细的观察、分析,他们一致认为猜想一不合理。理由是_______________

  【设计方案】同学们结合所学知识设计出如下探究方案:向盛有少量二氧化锰的试管中加入适量的该液体,并将带火星的木条放在试管口。

 【实验与事实】按上述方案进行实验,发现有大量气泡产生,带火星的木条复燃。

(2)【结论与解释】①以上事实证明猜想______________是正确的;

②产生气体的反应可用化学方程式表示为          

(3)【反思与评价】①在实验中,某同学提出应该先将气体收集,然后用带火星的木条检验,你认为_________(填“有”或“没有”)必要。

②为避免在今后的实验中出现标签残缺的情况,在倾倒液体时应注意          

(4)【拓展与迁移】 根据探究结果,重新贴好标签。标签上化学式中氧元素的化合价为___________价(已知氢元素显+1价)。

题型:单项选择题

简述物种形成的过程。

题型:单项选择题

《 * * 党宣言》的发表之所以成为马克思主义诞生的标志,主要是因为( )。

A.它是马克思、恩格斯亲自写成的
B.揭示了剩余价值规律
C.彻底否定了资本主义制度
D.第一次较为完整系统地阐述了马克思主义的基本原理

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