International competition makes the domestic market with the international market closely , the global market as a whole . the country that holds the inside track in the international competitiveness will have the initiative 2001年12月,我国以发展中国家的身份加入了世界贸易组织,标志着我国将全面融入经济全球化进程中,同时也标志着我国对外开放进入到一个崭新的阶段。
The bottom roller and sub - bottom roller of hcr is calculated about its equivalent stress , contact stress and the distributing of pulling - stress along the inside track of hcr . also , effects of hollowness and pinch fit are analyzed on bearing stress and rated load 主要计算预负荷空心圆柱滚子轴承的最底部滚子和次底部滚子的等效应力、接触应力和滚子内圈拉应力的分布情况，分析滚子空心度和过盈量对轴承应力和额定载荷的影响。
