您要查找的是不是：
- valve head margin 气门头边缘厚度
- Head margin The margin at the top of a page. 书页上边的空白部份。
- Head margin: The margin at the top of a page. 头白边:书页上边的空白部份。
- The results show that a part of the flow passage of the valve seat is occupied by the cavity under the valve head, leading to a decrease of flow rate. 研究结果表明：阀碟下方的空穴区占据了阀座喉部通流面积的一部分，使得有效的通流面积减小，影响了阀门的通流能力；
- Margins White space around the image area of a page. They are back margin, head margin, foredge margin and foot margin respectively. 页内围绕印纹面积的空白位。分别为内白边,头白边,外白边和脚白边。
- Margins: White space around the image area of a page. They are back margin, head margin, foredge margin and foot margin respectively. 白边:页内围绕印纹面积的空白位.;分别为内白边;头白边;外白边和脚白边
- Failure Analysis of Engine Valve Head Falling 发动机气门盘部弦位掉块失效分析
- emergency exhaust valve head connection 紧急排汽阀盖接头
- connection intercepting valve head 中间阀盖接头
- She nestled her head on his shoulder. 她将头依偎在他的肩上。
- intercepting valve head connection 中间阀盖接头
- Development of Automatic Test Experiment Set for Head Margin Stress 封头边缘应力自动测试实验装置的研制
- Have you turned off the water valve? 你关掉水阀了吗？
- The deer lowered its head to drink from the pond. 鹿低下头去喝池塘里的水。
- He gave the little boy a clout on the head. 他在那小男孩的头部打了一下。
- I saw the small girl topple over and hit her head. 我看见那小女孩栽了一跤，碰着了头。
- We need an eye bolt to fit this valve. 我们需要一个有眼螺栓来固定这个阀门。
- I was dazed by the blow on my head. 我的头挨了一击而觉得晕眩。
- She leaned her head back and whispered the news. 她向后仰着头，小声说出了这个消息。
- The horse kicked its fallen rider about the head. 那匹马乱踢从它背上掉下来的骑手的头部。
