密封的

A hermetic seal is used at the top of this sample box.

这个样品盒口用封条封着。

The hermetic seal on the packet means that the food lasts longer.

封袋封印表明食物能保存更长时间。

The ceramic plates of air valves against abration, corrosion, dust, dirt, and sand.

陶瓷阀板耐磨、耐腐蚀、耐固体颗粒侵蚀，寿命长，适合各种气体、液体阀门封。

This is an unsealed letter, don’t read it.

这是一封未封信, 不要看。

Food which has been closed up in tins is called tinned food.

封在罐头里食品叫作罐装食品。

To protect the security and stable of film meter, should select some kinds right airproof liquate.

为保证隔膜表使用可靠性和安全性，应根据不同用途选择合适封液。

Applicable to acid (except vaporish acid),alkali, ammonia, vapor, oil, organic solvent ,chemistry corrosiveness, filling airtight of rotary pump.

适用酸（除发烟硫酸）碱，，氨，蒸气，油品，有机溶剂，化学腐蚀性介质各种旋转泵，阀门填料封。

Chlorhydrin rubber properties of physical and chemical. process technology. adhesivenessand use in cold reducting machines were mainly introduced.

主要介绍氯醇橡胶机械性能、工艺性能、粘合性能及在制冷压缩机封中应用。

This paper introduces studying and using process of new type polyurethane sealing element,contrastes with similar import sealing element.

介绍新型聚胺脂封件研究开发和使用过程,并与进口同类封件进行对比,有一定实用价值。

The article analyzes the reasion of poor effect for cuppy fixed dummy block in aluminium alloy extrusion press.

综合分析式固定挤压垫实际封效果差原因,针对固定挤压垫结构进行改进。

The optimum operating parameters is the important way to improve seal performence of pump valve and to prolon...

因此，优化泵工作参数是提高泵阀封性能、延长其使用寿命重要途径。

The discharge voltage of some equipment like trigatron spark gap and so on in series compensation project is extremely important.

串补工程中封间隙等设备放电电压准确性至关重要。

As an important part of the ship,canopy plays the role of hermetization and protection of cargo,which influences the safeness of cargo directly in transportation.

舱盖是船舶重要组成部分,起着封、保护货物作用,它直接关系到货物运输过程中安全。

The cooling system consists of two reusable sealed water filled canisters that are easily refrozen in one step without the need for multiple freezing steps.

冷却系统中含有两个可以重复使用封冷却体，易于冷冻，一个步骤即可完成，不需要复杂冷冻程序。

The characteristic, structure, raw materials, equipment, process, cost and applications of arched colour plated roofing are introduced. The foams act as insulator, seal and waterproofer in roofing.

简要介绍用泡沫塑料保温、封、防水拱形彩钢屋面特点、构造、材料、设备、施工工艺、生产成本和应用。