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【简答题】
谐波齿轮传动由___、___和___三个主要零件组成。
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皮皮学刷刷变学霸
举一反三
【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】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: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
【简答题】Tom and Mike were good friends. 1 , sometimes they were not. But some of their classmates said they were like brothers. One day they went out for a walk together. 2 and they went into a restaurant to ...
【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.
右心室增大,压迫喉返神经
D.
左、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】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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