沉头机螺钉有哪两种头型？
Name two head styles of machine screws that are countersunk.
沉头内六角攻丝螺钉。
沉头内六角螺丝；
规格：平头冷墩模、沉头冷墩模、一序冲顶模、缩杆模等。
Specification: flat head cold-flow model, countersunk head cold-flow model, primary drawing mould, pole-shorten model, etc.
利用沉头孔通孔二次定位加工沉头孔盲孔的方法，可提高批量较大、精度要求较低的沉头孔加工效率，节约企业的加工成本。
This paper discussed a method of counterbore machining by using though-hole orientation to improve the efficiency of lower exact counterbore volume-produce and reduce the cost of corporation.
我头有点发沉。
让脸上的皮肤放松离开中线沉向耳朵的方向，头两侧的皮肤则沉向地板的方向。
Allow the skin of the face to release away from the midline and fall towards the ears and the floor on either side of the head.
本文头后介绍了地貌长沉开形特征量化模型和地貌长沉开形特征量化的GIS实现方式及入程。
This article firstly introduces the quantitative model of topography multi-fractal characteristics and the implement process on GIS.
后因玩水晶能量过了头，而导致自己的国家也陆沉到大西洋去。
After the crystal energy due to play too far, resulting in their own countries to sink into the Atlantic Ocean.
趣道WBT重量平衡机械学原理，减少“头沉”问题，有效减少钓手疲劳度3到4级。
BONTAO adopts WBT (Weight Balance Technique) to overcome the problem of "heavy-head", which effectively reduces the angler's fatigue by 3 to 4 degrees.
我尽最大努力去学习怎样保持漂浮，可是很奇怪我的头总是要沉到水面下去，就像跳水的那个姿势…晕！
I tried my best to learn how to remain suspended, but it was strange that my head always sank into the surface, which just like the posture of diving... faint!
提出夯扩头最大直径计算方法，并对沉管桩和夯扩桩的经济效益进行分析比较。
The calculation methods of maximum diameter of ram extension hair is put forward.
提出夯扩头最大直径计算方法，并对沉管桩和夯扩桩的经济效益进行分析比较。
The calculation methods of maximum diameter of ram extension hair is put forward.
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