Name two head styles of machine screws that are countersunk.

沉头机螺钉有哪两种头型？

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I removed the last of the screws and took the back off the machine.

我旋下最后一颗螺丝钉，打开了机器的后盖。

youdao

I removed the last of the screws and took the back off the machine.

我旋下最后一颗螺丝钉，打开了机器的后盖。

youdao