石膏的

PURPOSE: The objective of this study was to survey the amount of working cast model of denture restoration, and to calculate the amount of die stone powder of each working cast model, then to classify the working cast model, with the expectation to perfuse the working cast model in clinic according to this classification, and to achieve the goal of increasing quality of working cast model and saving materials.

目的：通过测量义齿修复工作模型重量，计算各模型所含超硬石膏粉的用量，再按其粉用量，对义齿修复工作模型进行统计学分类。

The first type is different kinds of rocks including sedimentary rock, metamorphic rock and volcanic rock among which black mudstone, black shale, clay, slate, phyllite, granite, basalt, andesite and volcanic ash are the best except some chemically depositional rock such as salt rock, gypsum, limestone.

第一类是自然界各种不同类型的岩石，包括沉积岩、变质岩和火山岩，其中以黑色泥岩、黑色页岩、粘土、板岩、千枚岩、花岗岩、玄武岩、安山岩及火山灰为最佳，但不包括某些化学沉积岩，如盐岩、石膏、石灰岩。

He had a plaster cast on his leg.

他的腿上了石膏。

Ex:I have to wear a plaster cast on my arm because I fracture d it.

我的手因为骨折而必须打上石膏。

You fractured leg should be plaster cast .

你那条骨折的腿要上石膏。

The doctor put a plaster cast on my broken leg.

医生给我的断腿上石膏。

The doctor had to hold his broken arm with a plaster cast.

医生不得不用石膏绷带来固定他断了的胳膊。

The doctor had to hold his broke n arm with a plaster cast.

医生不得不用石膏绷带来固定他断了的胳膊。

Duplicators were used for the production of large forming dies for the automotive industry, where models made of wood, plaster of paris, or wax were employed.

复印机被用于生产大型模具成形的汽车产业，在模型木材，石膏或蜡被雇用。

Used since ancient times, plaster of paris is so called because of its preparation from the abundant gypsum found in Paris.

古代便开始使用熟石膏，因调制品泰半来自巴黎盛产的石膏而得名。

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。