查询词典 chemical method

As an important chemical analysis method, sequential extraction is the main link in analysis of heavy metals in soils, but adopting single extraction procedure for different types of soil and different forms of heavy metals makes it very difficult to compare the results.

连续提取法作为一种重要的化学分析方法，是土壤中重金属元素形态分析的主要环节，但同一种提取法对于不同的土壤类型及同类土壤中不同重金属形态的提取效果差异很大。

This article expounds a compounding method of solution in an-cyanide chemical silvering within a condition of normal atmospheric temperature and pressure and the silvering principle and the operation of the process.

文摘：阐述了一种常温常压条件下使用的化学无氰镀银工艺的溶液配制方法及镀银原理和操作过程。

They also will study chemical and physical properties of the soil samples with a method called infrared spectroscopy.

他们将运用一种称为红外光谱的方法研究土壤样本的化学物理性质。

In this article, the influence of chemical composition on both high and low temperature graphitization of spheroidal graphite malleable is investigated by the use of method of mea-suring graphitization expansion and OMNICOM-type image analyzing instrument.

本文利用测量石墨化膨胀的方法和OMNICOM图像分析仪，研究了化学成分对球墨可锻铸铁高温和低温石墨化的影响。

The changes of morphology and mass in the process of pretreatment,the morphology and the phase constitution of chemical conversion film formed by stannate were studied using scanning electron microscope,X-ray diffraction and the mass loss method.

利用扫描电镜、X射线衍射和质量损失等手段，研究预处理前后的表面形貌及质量变化和锡酸盐化学转化膜层表面形貌及其相组成，采用盐雾和湿热实验箱检验膜层的抗腐蚀性能。

The changes of morphology and mass in the process of pretreatment, the morphology and the phase constitution of chemical conversion film formed by stannate were studied using scanning electron microscope, X-ray diffraction and the mass loss method. The corrosion resistance of film were studied by salt spay test and damp test.

利用扫描电镜、X射线衍射和质量损失等手段，研究预处理前后的表面形貌及质量变化和锡酸盐化学转化膜层表面形貌及其相组成，采用盐雾和湿热实验箱检验膜层的抗腐蚀性能。

In this paper,the chemical stability of streptomycin sulfateis studied by the method of raising temperature freely.

药物的化学稳定性是药物的一个性质，是衡量药物有效期及药物剂型、剂量的重要指标。

In this paper, Melnikov's method is used to discuss a dass of equation governed by flickering on catalytic wires and in chemical reactor, the conditions of the existence of subharmonic bifurcation are obtained.

研究一类描述催化反应的flickering现象的动力系统，应用Melnikov方法对三种不同情形分别给出了系统存在次谐分枝的某些充分条件。

But the subtractive method, while requiring complex chemical techniques, has turned out to be more practical

但减色法尽管需要复杂的化学技术，最终比前者更加实用

This method was applied to the chemical valence analysis of sulfur.

对卡尔曼滤波方法在多组分同时分析中的应用进行了深入研究。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。