 |
正规扣型
| 螺纹
| 正规扣型 | |
| dril. | regular |
| 螺纹 | |
| bridg.constr. | spiral burr |
| hydroel.st. | worm; thread |
| mech. | screw |
| space | screw flight; spiral flight |
| tech. | helical burr; rib weave; whorl |
| |||
| regular | |||
|
正规扣型 : 3 phrases in 1 subject |
| Drilling | 3 |
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