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【单选题】
圆管的层流流动，其切应力的分布下列说法正确的是( )。A.
圆心处切应力为零，随半径成线性分布
B.
圆心处切应力为零，随半径成抛物线分布
C.
管壁处切应力为零，随半径成线性分布
D.
管壁处切应力为零，随半径成抛物线分布
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】I've become good friends with several of the students in my school _____ I met in the English speech contest last year. [ ]
A.
who
B.
where
C.
when
D.
which
【单选题】I’ve become good friends with several of the students ___helped me in the English speech contest last year.
A.
who
B.
where
C.
when
D.
which
【单选题】--- Kathy, you’ve got a chance to deliver a speech at the conference? --- Yes, but how could I ______ the meeting date fixed so soon?. [ ]
A.
while
B.
as
C.
after
D.
with
【单选题】- Professor Johnson, I’ve won the first place in the Final English Speech Competition. - __________. It’ s really something.
A.
Come on
B.
Absolutely
C.
That’s a good point
D.
Good for you
【单选题】关于心电图,描述不恰当的是
A.
国际通用导联体系称为常规12导联体系
B.
在每一个导联正、负电极间均可画出一假想的直线,称为导联轴
C.
标准导联为双极肢体导联，反映某个肢体电位的变化
D.
胸导联属单极导联，包括V1-V6 导联
E.
加压单极肢体导联为单极导联，基本上代表检测部位电位变化
【单选题】— Are you confident about the English Speech Contest, Sally? — __________. I’ve got everything ready!
A.
Of course not
B.
It’s hard to say
C.
Sure, I am
D.
I am afraid not
【简答题】受（ ）的影响，个体记住的，往往是对他有意义的或者是以前知道的东西。
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