卧式铣床主轴轴承长期使用后产生（）是造成主轴受切削力后让刀的重要原因。
A.变形
B.位移
C.间隙
D.划伤
参考答案：C
It was George Orwell ____ real name is Eric Arthur Blair ____ wrote many political novels and essays. [ ]
A. who; which
B. whose; which
C. who; that
D. whose; that
最小附加原则
ssays. [ ]