车床主轴变速箱安装在床身上,应保证主轴中心线对溜板移动在垂直平面内的平行度,并要求主轴中心线()。
A、只许向前偏
B、只许向后偏
C、只许向上偏
D、只许向下偏
参考答案:C
When you see Tom and his sister, tell _____ that _____ mother is waiting at the gate.[ ]
A. his; his
B. her; hers
C. them; their
D. his; her
少尿或无尿