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【单选题】
What did this study accomplish?A.
The study allows doctors to control the part of HIV that's active in the body quite well.
B.
The hidden pool of HIV is named as the reservior through this study.
C.
The hidden pool of HIV is lowered modestly in the four patients.
D.
The hidden pool of HIV could be reduced more than 80 percent.
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【单选题】Many Cherokees died on their way to their new home mainly because ______.
A.
they were not willing to go there
B.
the government did not provide transportation
C.
they did not have enough food and clothes
D.
the journey was long and boring
【单选题】差速器的运动规律是:假设一个半轴齿轮的转速为n1,另一个半轴齿轮的转速为n2,差速器壳的转速为n,则有( )
A.
n1+ n2=n
B.
n1+ n2=2 n
C.
n1- n2=n
D.
n1=n2=n/2
【单选题】室间隔缺损的患儿有时出现声音嘶哑,最常见的原因为
A.
左心室增大，压迫喉返神经
B.
肺动脉扩张，压迫喉返神经
C.
左、右心室增大，压迫喉返神经
D.
右心室增大，压迫喉返神经
E.
左心房增大，压迫喉返神经
【单选题】差速器的运动规律是,设一个半轴齿轮的转速为n1,另一个半轴齿轮的转速为n2,差速器壳的转速为n0,则:
A.
n2+n1=n0
B.
n2+n1=2n0
C.
n2一n1=n0
D.
n1一n2=n0
【单选题】差速器的运动规律是:假设一个半轴齿轮的转速为 n1 ,另一个半轴齿轮的转速为 n2 ,差速器壳的转速为 n0 ,则有( )
A.
n1+ n2=n0
B.
n1+ n2=2 n0
C.
n1- n2=n0
【单选题】室间隔缺损的患儿有时出现声音嘶哑，最常见的原因为
A.
左心室增大，压迫喉返神经
B.
肺动脉扩张，压迫喉返神经
C.
左、右心室增大，压迫喉返神经
D.
右心室增大，压迫喉返神经
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