Implants for osteosynthesis - bone plates - specification for holes corresponding to screws with asymmetrical thread and spherical undersurfaces 骨接合术用外科植入物.第23部分:金属接骨板.第3节:不对称螺纹球形底面螺钉的螺钉孔
5 . 6 excellent hole bottom surface sunken degree of depth quite on 15mm , flawed or damaged area quite on bottom 2 3 of area allow artificial to mend 5 . 6棒孔底面凹陷深度不大于15mm ，缺损面积不大于底面积的三分之二允许人工修补。
We learned the character of a taper . a taper has a point , a height , two sides . the underside is a circle , and we learned the formula of a taper 生：知道了圆锥的特征，圆锥有一个顶点，有一条高，有两个面，底面是圆形，圆锥的体积公式。
Implants for osteosynthesis - bone screws and auxiliary equipment - specification for screws having symmetrical and asymmetrical thread and conical undersurfaces 接骨用植入物.接骨螺钉和辅助设备.有对称和不对称螺纹及圆锥形底面的螺钉规范
Also the concrete structure ' s service life may be threatened by the negative pressure occurred when waves se parate from the subface of the structures 另外当波浪离开上部结构底面时产生的负压力作用对混凝土结构的耐久性也是一个很大的威胁。
This directs a waveform toward the floor , which bounces back up and interacts with the vibrating bottom head to cancel or emphasize certain frequencies 这个直接向着地板去的声波将被反弹上来并且会对底面鼓皮的震动造成相消或加重某些频率的影响。
The optical field attenuates as exponential function and the transmitted beam expands quickly with the increase of the distance away from solid immersion lens 固体浸没透镜的折射率越大，底面出射的光斑越小，但随着离开固体浸没透镜底面距离的增加，光斑增大得越快。
Why can we get the same result in the first and the third experiments ? compare the first one : what ' s the relationship between their undersides and their heights 师：第一次和第三次的实验结果为什么都是3次？先比一比第一组，这个圆柱和这个圆锥的底面和高有什么关系？
Auto - shining general purpose water - based polish for leather uppers or outsole . it gives a pleasant glossy finish and a soft silk - like touch 高光泽的皮革亮光剂,可单独使用,在皮底打腊后喷洒此产品可达到极佳防水效果,也可与皮底面油搭配使用。适用皮料：真皮大底及各种面皮。
