题目内容

1、压力容器中，封头与筒体之间一定要有密封装置。

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2、薄壁容器中的薄膜应力大小与材料无关。

They can help you through ______ in your application.

To have a better chance of ______ and being qualified for a lower interest rate.

No payment is made until six months after ______ .