四级的

Kun-Yen Ho had treated a 50-year-old female patient, as usual with the habit of drinking vinegar health, dental pain that was later to seek medical treatment, after examination revealed that she had the fourth-class dental etching, exposed more than two-thirds of dentin Second, does not timely processing, pulp nerve may be Louzaiwaimian.

何坤炎曾收治一名50多岁的女性病患，由於平常有喝健康醋的习惯，后来觉得牙齿酸痛前往就医，经过检查发现，她已是第四级牙齿酸蚀，牙本质暴露超过三分之二，再不及时处理，牙髓神经可能就会露在外面。

Continuous ethanol fermentation using self-flocculating yeast SPSC01, a fusant from Saccharomyces cerevisiae and Schizosaccharomyces pombe, and two-stage enzymatic hydrolyte of dry milling corn powder, was continuously run for 120 days.

在一套四级串联悬浮床生物反应器系统中，以双酶法制备的玉米粉糖化液为底物，进行了废糟液全循环条件下自絮凝颗粒酵母乙醇连续发酵的实验研究。

I am about to be a junior college student. Love to be a friend of you, at your service anytime.

我的英语水平已过了专业四级水平，德语也已接近可以自由交流，希望能对您的工作提供帮助。

Level 4 - Increases the Lycanthropy's movement speed by 12% and attack rate by 27%.

四级 -提升狼人27%的攻击速度和12%的移动速度。

It is made up of a gearbox and moderate breeze gear wheel transmission that the MG400/900-3.3D type mining machine cuts the cutting department, cut the electrical machinery of cutting department and put to fix up horizontally in the rocker arm, the power that the motor outputs leans on a round of transmission of department of gear wheel and planet round via the tertiary straight tooth, urge the cylinder to rotate finally.

MG400/900-3.3D型采煤机截割部主要是由一个减速箱和四级齿轮传动组成，截割部电机放在摇臂内横向布置，电动机输出的动力经由三级直齿圆拄齿轮和行星轮系的传动，最后驱动滚筒旋转。

It is made up of a gearbox and moderate breeze gear wheel transmission that the MG250/591-WD type mining machine cuts the cutting department, cut the electrical machinery of cutting department and put to fix up horizontally in the rocker arm, the power that the motor outputs leans on a round of transmission of department of gear wheel and planet round via the tertiary straight tooth, urge the cylinder to rotate finally.

MG250/591-WD 型采煤机截割部设计主要是由一个减速箱和四级齿轮传动组成，截割部电机放在摇臂内横向布置，电动机输出的动力经由三级直齿圆拄齿轮和行星轮系的传动，最后驱动滚筒旋转。

It is made up of a moderate breeze gear wheel transmission that the MG400/920-WD type mining machine cuts the cutting department, cut the electrical machinery of cutting department and put to fix up horizontally in the rocker arm, the power that the motor outputs leans on a round of transmission of department of gear wheel and planet round via the tertiary straight tooth, urge the cylinder to rotate finally.

MG400/920-WD 型采煤机截割部主要是由四级齿轮传动组成，截割部电机放在摇臂内横向布置，电动机输出的动力经由三级直齿圆柱齿轮和一级行星轮系的传动，最后驱动滚筒旋转。

It is made up of a gearbox and moderate breeze gear wheel transmission that the MG200/456-AWD type mining machine cuts the cutting department, cut the electrical machinery of cutting department and put to fix up horizontally in the rocker arm, the power that the motor outputs leans on a round of transmission of department of gear wheel and planet round via the tertiary straight tooth, urge the cylinder to rotate finally.

MG200/456-AWD 型采煤机截割部主要是由一个减速箱和四级齿轮传动组成，截割部电机放在摇臂内横向布置，电动机输出的动力经由三级直齿圆拄齿轮和行星轮系的传动，最后驱动滚筒旋转。

Itis made up of a moderate breeze gear wheel transmission that theMG400/920-WD type mining machine cuts the cutting department, cutthe electrical machinery of cutting department and put to fix uphorizontally in the rocker arm, the power that the motor outputsleans on a round of transmission of department of gear wheel andplanet round via the tertiary straight tooth, urge the cylinder torotate finally.

MG400/920-WD 型采煤机截割部主要是由四级齿轮传动组成，截割部电机放在摇臂内横向布置，电动机输出的动力经由三级直齿圆柱齿轮和一级行星轮系的传动，最后驱动滚筒旋转。

Itis made up of a gearbox and moderate breeze gear wheel transmissionthat the MG400/900-3.3D type mining machine cuts the cuttingdepartment, cut the electrical machinery of cutting department andput to fix up horizontally in the rocker arm, the power that themotor outputs leans on a round of transmission of department ofgear wheel and planet round via the tertiary straight tooth, urgethe cylinder to rotate finally.

MG400/900-3.3D型采煤机截割部主要是由一个减速箱和四级齿轮传动组成，截割部电机放在摇臂内横向布置，电动机输出的动力经由三级直齿圆拄齿轮和行星轮系的传动，最后驱动滚筒旋转。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。