Up to medium size, cylindrical roller bearings are generally fitted with a cage of glass-fibre reinforced polyamide or a pressed sheet-steel cage.
直到中号尺寸，圆柱滚子轴承一般都配置一个玻璃纤维增强尼龙保持架或一个钢板冲压保持架。
2
Meanwhile, the difference in thermal conductivity of underlining materials (plastic sheet, steelsheet and aluminium plate) has little effect on the etching rate.
研究还发现，不同垫层（塑料片、钢片和铝板）导热性能对刻蚀速率影响很小。
3
Additional components such as alloy sheetsteel strip covers are available to protect the linear guidance systems and drive unit.