已知某井钻井液PV=12mPa•s,YP=3Pa,DH=21.6cm,DP=12.7

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问题:

已知某井钻井液PV=12mPa•s,YP=3Pa,DH=21.6cm,DP=12.7cm,va=1.2m/s,则宾汉流体的视粘度为()。

A、16.66mPa•s

B、15.66mPa•s

C、14.49mPa•s

D、10.66mPa•s

考点:钻井液工考试钻井液工高级技师钻井液工高级技师题库
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Learning in class is a way for students to study. Students sit in the classroom and   小题1:to the teacher. Is this the   小题2: way for students to learn something? Of course not. There is another way to learn, that is, students can teach   小题3:.
How do you teach yourself ? The   小题4: thing you must do is reading. Read something you are interested in,   小题5: what you have to read. The second is that you must ask yourself 小题6:. You can write down the questions. A clever student is usually good at   小题7: questions. The third is to answer the questions yourself   小题8: thinking hard, by reading the text or other books, and sometimes by asking other people. This is the way of teaching yourself. And you must do all these by yourself. If you keep  小题9: like this for a long time, you are sure to   小题10: in your study.
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What a fine weather we are having!

题型:单项选择题

男性,30岁。颌面部受击打伤3小时。口腔检查:下颌颏部软组织红肿,口腔内外未见创口,咬合关系无异常。下颌正位片示下颌颏部正中有骨折线影像。正确的固定方法是

A.手术切开骨间固定

B.牙弓夹板固定

C.骨钉加金属支架固定

D.克氏针内固定

E.皮质骨螺钉固定

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如图所示,一滑块从半圆形光滑轨道上端由静止开始滑下,当滑到最低点时,关于滑块动能大小和对轨道最低点的压力,下列结论正确的是(  )

A.轨道半径越大,滑块动能越大,对轨道的压力越大

B.轨道半径越大,滑块动能越大,对轨道的压力与半径无关

C.轨道半径不变,滑块的质量越大,滑块动能越大,对轨道的压力越小

D.轨道半径不变,滑块的质量越大,滑块动能越大,对轨道的压力越大

题型:单项选择题

以下哪项不是基托缓冲的目的

A.防止压痛

B.防止有碍发音

C.防止压迫牙龈

D.防止压伤黏膜组织

E.防止基托翘动

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