M1432万能外圆磨床提高横向进给精度的措施是什么?
参考答案:
1、设置闸缸;
2、采用滚动导轨,设有缓冲装置,以减少定位时的冲击和防止振动;
3、采用定程磨削和微量调整。
— What do you do in winter?
— I often _________________.[ ]
A. skate on the ice
B. skating now
C. swim in the water
D. wear T-shirts and shorts
方程xy-10(x+y)=1的整数解为 ______.