影响前滑的因素有()、()、()、()和()等。
参考答案:辊径;摩擦系数;压下率;轧件厚度;孔型形状
书面表达
作为学生,辛苦学习了一周,一定很累了!周末到了,你肯定很开心吧!你的周末怎么安排呢?请以My Saturday为题,写一篇短文,介绍一下你周六的活动。30 -40词左右。
提示语:get up, go to school, do homework, help Mom cook dinner, play computer games,watch TV,
play ping-pong
Crash-Prone The Solution Could Be Windows XP;But does It Make Sense to Upgrade Your Operating System
Microsoft recommends an XP upgrade for ______.A. all personal computers without XPB. PCs built within the past two yearsC. old personal computersD. PCs which often crash