| 1. | The early system were known as open systems, because the oil-filler cap was open, or vented to the atmosphere .
早期的控制系统，就是人们所知道的“开式”系统，因为它的加机油管盖是开式的，或者说因其与大气连通。 |
| 2. | Push - on varieties were also available , but are not frequently used
（除旋转式管盖外， ）还有下推拉式的管盖，但是并不常用。 |
| 3. | Membraseal - type tubes are usually pierced open with a “ spike ” cap of polythene or hard plastics
破封型软管则经常配有聚乙稀或硬塑料制的“钉状”管盖以刺穿密封的管口。 |
| 4. | Fixed railway installations . compact ducting in reinforced concrete for electric lighting cables . covers for 90 degrees elbows
铁路固定装置.照明电缆用嵌入钢筋混凝土的密排导管.弯管盖 |
| 5. | Fixed railway installations . compact ducting in reinforced concrete for electric traction cables . covers for 90 degrees elbows
铁路固定装置.电气牵引电缆用嵌入钢筋混凝土中的密排导管.弯管盖 |
| 6. | Fixed railway installations . compact ducting in reinforced concrete for electric lighting cables . covers for vertical bends
铁路固定装置.电气照明电缆用嵌入钢筋混凝土内的密排导管.垂直弯管盖 |
| 7. | Fixed railway installations . compact ducting in reinforced concrete for electric lighting cables . stirrups for securing vertical bend covers
铁路固定装置.电气照明电缆用嵌入钢筋混凝土内的密排导管.固定垂直弯管盖用蹬形夹 |
| 8. | Fixed railway installations . compact ducting in reinforced concrete for electric traction cables . stirrups for securing vertical bend covers
铁路固定装置.电气牵引电缆用嵌入钢筋混凝土中的密排导管.固定垂直弯管盖的蹬形夹 |
| 9. | With certain shapes of nozzle or canula , elongated caps are made to cover both canula and threaded portion , and seal the canula at its top
根据管口和导管的不同形状，可以制造细长的管盖以覆盖导管和螺纹部分，并在顶部封住导管。 |
| 10. | Closures for collapsible tubes are generally made of plastics materials today , and both thermosetting and thermoplastics types are available with a variety of external shapes and internal threads for screwing tightly on to tube nozzle
当今， (装)膏状物小(金属)管的管盖通常由塑料材料制成，不管是热硬化性塑料还是热塑性塑料皆可，它们外型各异，并配有不同的内螺纹以保证管盖与管口能拧紧。 |
