This sample has been burned in the bottom because the venting is not good, we can add an insert in the middle of the rib.
这个样板的筋骨位底部烧焦，是因为排气不良，我们可以在筋骨位的中间增加一个镶件。
An effective control of cracks at oil-reserving bottom comes from increasing strength of the bottom by thickening reinforcing rib, and increasing frequency by reducing noise also achieves.
采取增厚加强肋的办法不断提高了油底壳的强度，而且也达到了降噪增频的作用，从而有效地控制了油底壳的裂纹。
Thellos sample has been burned in the bottom because the venting is not good, we can add an insert in the middle of the rib.
这个样板的筋骨位底部烧焦，是因为排气不良，我们可以在筋骨位的中间增长一个镶件。
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