It can also be seen in Fig. 12.2 that a core drill has flat end.

在图12.2中同样能看到，空心钻具有平坦的端部。

youdao

It can also be seen in Fig. 12.2 that a core drill has flat end.

在图12.2中同样能看到，空心钻具有平坦的端部。

youdao