What are dental calculus and odontolith?

How to remove dental calculus and odontolith?

怎样除去牙垢和牙石 呢 ?

It can also be used in desalter, evaporator, heating and cooling facilities and water pipeline.

也可用于造水机 、 蒸发器 、 加热设备、冷却设备和供水管路,以清除水垢和水锈.

At present, the method to remove scale is mainly divided into: chemical methods and physical methods.

目前, 国内清除水垢的方法主要分为: 化学方法和物理方法.

This causes the salt to drop out of solution, with net effect being a harden scale.

无机碱盐水溶液的饱和点通常随着温度和浓度的升高而降低,这将造成皂化剂中盐的析出,形成坚固的水垢.

Water scales the boiler.

水使锅炉生水垢.

Flush dirt and scale from supply pipe.

从供应管道内冲刷污垢和水垢.

Mineral deposits water spots , alumina, silica, soap scum, oxides , scale, rust.

金属沉淀物, 水垢,矾土, 硅石, 肥皂泡, 氧化物, 锈迹.

Unlike metal, plastics never rust, scale , or pit-they virtually last forever.

与金属不同, 塑料不会生锈 、 生水垢或凹陷,实际上塑料使用寿命更长.

PROPERTIES : With axial resin canals. bark: Black, coarse and scaly when trees young.

具轴向树脂沟. 树皮>黑色 ﹐ 粗糙﹐鳞片状一幼龄木.

Almost fully crossed scales plus some golden head features.

几乎过背的鳞片及若干的金头特征.

Plastics, rubber, clay, glass steel, glass flake lining works.

塑料 、 橡胶 、 胶泥 、 玻璃钢 、 玻璃鳞片衬里工程.

We remove the scale by a process called pickle.

我们用一道叫做酸洗的工序来除去鳞片.

Being one half step lower than the corresponding natural key.

比相应的正常调低半个音阶的.

He introduced 12-note music instead of the old scale of eight notes.

他用12个音符代替旧的8个音符音阶.

Different effects are created when music is based on other scales.

作品若是以另外一些音阶为基础,出来的效果就不一样.

He played some basic scalar patterns on his guitar.

他在自己的吉他上弹了几个音阶.

I've had it up to here with the sound ofbad scales.

无聊的音阶声已使我受够了这儿.

Reducing the scale may be considered to be part of transforming geographic coordinates plane coordinates.

另外,还原地图比例尺也可以被认为是坐标变换过程的一部分.

By the 19 th century a 1-12 ratio had become the norm, and dollhouses had evolvedsintoschildren's toys.

在19世纪时,1比12的比例尺成为标准, 玩具屋也进而变成了小朋友的玩具.

A scanning image vectorization system was developed in combination of characteristic of big scale scanning map.

结合大比例尺扫描地形图的特点,研制了扫描图矢量化系统.