There are two types of seals. Static seal and dynamic seal.

密封垫的种类有两种。静密封和动密封。

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Last, a 9-stage compressor rotor was taken as an example, the effects of different types of seal on the rotor stability were compared.

最后以一台九级合成气压缩机转子为例，比较不同密封对转子稳定性的影响。

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Deep Groove ball bearings are the most popular of all the ball bearing types because they are available in a wide variety of seal, shield and snap-ring arrangements.

深沟球轴承是所有类型的球轴承最流行的，因为他们是在一个密封，盾牌和管理各种各样的戒指安排可用。

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The Ministry of Education issued a decree establishing an official seal of approval and two types of certificate to be awarded to states and municipalities who succeed in providing good and effective basic education, including youth and adult literacy programmes.

UNESCO: Country Profile: Brazil