Very few whitening toothpastes have undergone any type of clinical trial, and ones that are too abrasive can damage teeth or make them very sensitive.
很少有美白牙膏经过任何形式的临床试验，有些美白牙膏摩擦剂含量过多，会伤害你的牙齿或让你的牙齿变得过分敏感。
Abrasive machining for eccentric shaft of rolling cut type sizing shear has been described in this paper.
介绍用磨削方式加工临钢滚切式定尺剪偏心轴的方法。
By changing the abrasive wheel it can also process different type and outline .
另外该机床也能够对其它一些工具零件进行表面加工。
The main characteristics of abrasive wheels include five factors, namely abrasive material, grain size, hardness, structure and bond type.
砂轮的主要特征包括磨料、粒度、硬度、组织个结合剂五个因素。
On the basis of self oscillating pulse water jet and pre mixed abrasive water jet, a new type abrasive jet, self oscillating abrasive water jet (SOAWJ), is put forward.
自激振荡磨料射流是在自激振荡脉冲射流和前混合磨料射流基础上，提出的新型射流。
New type PDC cutters and heavyset gage design promote longer bit life in hard and abrasive formations.
新型切削齿及高密度保径布齿提高钻头在硬研磨性地层中的使用寿命。
A new type of magnetic abrasive is introduced and its machining property has been studied through experiments from which the optimal proportion of the abrasive mixture has been obtained.
介绍了一种新型的磁性磨料，并对该磨料的加工性能进行了实验研究，得到了该磨料的最佳配比。
As a new type of precision polishing technology, surface polishing using abrasive water jet has unique advantages, such as polishing hard-polishing materials etc.
磨料水射流表面抛光技术作为一种新型的精密抛光技术，其具有的独特优势使其可以在各种难以抛光材料的抛光中发挥作用。
A new type of nozzle generating swirling-abrasive water jet has been designed and the numerical method is employed to analyze the characteristics of the jet flow in the nozzle.
设计了一种水垫式旋转磨料射流喷嘴，并对其内部流场流动特性进行了数值研究。
The working principles, structures and characters of these two kinds of mixing systems are analyzed in the article. A new type of abrasive jet named as abrasive suspension jet is also introduced.
分析两者的工作原理、系统结构和特点，并介绍一种新型磨料射流——磨料浆体射流。
Black Aluminium Oxide AbrasiveBlack Aluminium Oxide abrasive (lower Aluminium Oxide abrasive) is a new type abrasive material for polishing various metal works.
黑刚玉砂(又名低铝刚玉砂，铁砂粉)是一种新型抛光材料。
Cold resistant conveyor belt can be divided into three types according to cover properties:Laceration resistant type(H), Anti-abrasive type(D), and Ordinary type(l).
耐寒输送带根据覆盖胶性能分为耐划裂型（H）、耐磨损型（D）、一般型（L）三种类型。
Black Aluminium Oxide Abrasive
Black Aluminium Oxide Abrasive(lower Aluminium Oxide Abrasive)is a new type abrasive material for polishing various metal works.
黑刚玉砂（又名低铝刚玉砂，铁砂粉）是一种新型抛光材料。
Black Aluminium Oxide Abrasive
Black Aluminium Oxide Abrasive(lower Aluminium Oxide Abrasive)is a new type abrasive material for polishing various metal works.
黑刚玉砂（又名低铝刚玉砂，铁砂粉）是一种新型抛光材料。
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