It can be used without sealing layers to provide an excellent sealing but there is a risk of flange surface damage especially at high seating pressure.
也可不带密封层直接使用，且能直到良好的密封效果，但在高压场合中容易对法兰的表面造成损失。
The two beaches are natural preserved without pollution or damage. The sand is clean with golden color. The sea water is crystal. It is an excellent bathing beach.
两沙滩保留了天然的纯洁，未受污染和破坏，沙质洁净，色泽金黄，海水清澈，是优质的海滨浴场。
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