【简答题】主轴回转轴线的误差运动可以分解为纯()、纯轴向窜动和纯()三种基本形式。
【单选题】主轴回转轴线的误差运动可以分解为纯径向跳动、纯轴向窜动和纯倾角摆动三种基本形式,其中,()会造成镗出的孔呈椭圆形。
【多选题】设总体X~U(θ, 2),未知参数θ<2. 设【图片】是总体X的简单随机样本,【图片】是样本均值,则下列估计量中不是θ的相合估计量的是
【单选题】Why is Tom so tired?
A.
He worked too hard in his garden.
C.
He is not in a good mood.
D.
He had to look after a cat.
【简答题】机床主轴回转轴线的运动误差可分解为和____、____、____ 。
【简答题】______ tired of Tom's all-talk-no-action attitude, Julia decided to do the job all by herself A) To get B) To have got C) Getting D) Have got
【单选题】Tom was so tired that he fell _________on the bed and went to sleep
【简答题】主轴的回转误差可分解为( )、( )和( )三种基本形式。