测定时间

In this activity, you will use two photogates to measure the amount of time it takes for an object to move a measured distance.

在这个实验中，你将使用两个光门，来测量物体移动某个测定的距离所花费的时间。

Nepetalactone, the primary component of catnip oil, were extracted by the using method of simultaneous distillation-extraction and separated by using silica gel chromatography column. To compare the repellency of nepetalactone and DEET on mosquitoes, topical bioassay method on the skin and a cage olfactometer were employed to assess the effective protection time and the spatial repellency.

采用同时蒸馏萃取及硅胶柱层析法从猫薄荷Nepeta cataria植物中提取、分离制得驱蚊有效成分假荆芥内酯，并采用个体涂肤有效保护时间测定法及风洞空间驱避效果测试法，对假荆芥内酯与避蚊胺的驱蚊效果进行了对比试验。

The method permits the detection or determination of GST isoenzymes typically in a time of the order of 30 minutes from initial contact with immobilised anti-GST antiboby.

该方法自开始至与所固定的抗－GST抗体接触时算，允许在30分钟的时间内完成GST同功酶的检验和测定。

Ordinate's Spoken English Test is the only completely automated test of spoken English.

PhonePassTM SET测试方案是目前唯一可以投入商业使用的全自动英语口语测试体系，它可在五到十二分钟时间的电话交谈中测定出参试者的英语口语实际听说能力。

The method was used in analysis of papaverine hydrochloride concentration in rabbit vein blood after injecting papaverine hydrochloride injection.

测定了兔子静脉注射盐酸罂粟碱注射液后不同时间内血液中盐酸罂粟碱的含量，对其药时曲线进行了研究。

The exchange yield is determined by paper chromatography and reaction rate constants are calculated at different pH values.

采用纸层析法测定了不同时间的交换率，计算了不同pH下的反应速度常数。

The results showed that the half of decay time of methyl parathion in Chinese cabbage was 2.91 days.

喷药后，在第零天、第一天、第二天、第三天、第五天、第七天分别取样，用气相色谱法分析测定甲基对硫磷在小白菜上的残留量，得出甲基对硫磷残留量与时间的关系。

The concentration of monomethyihydrazine in brain increased along with perfusion time and monomethylhydrazine concentration in the perfusate.

MMH灌流浓度分别为145，290和580mgL^(-1)，灌流时间为2，5，8及10min；采用对-二甲氨基苯甲醛比色法进行脑组织中的MMH浓度测定。

He method of microwave heating was used to determine the permanganate index of different water sample.

利用微波加热方法测定了不同水样中的高锰酸盐指数，讨论了微波功率、时间、酸度等条件对分析结果的影响，并与标准方法相对照，用t－检验法及 F－检验法检验，均没有明显差异

In order to overcome the shortcomings of acellular dermal matrix used as tissue engineering scaffold material, such as bad permeability, low degradation speed, and strong immunogenicity, a new type of collagen scaffold was prepared by applying various chemical, biological and physical comprehensive methods to deal with pigskin. The microstructure of the scaffold was observed under photomicroscope and scanning electron microscopy, and the in vitro degradation time, permeability, tensile-strength, porosity, shrinkage temperature were tested.

为了克服猪脱细胞真皮基质作为组织工程支架材料渗透性差、降解速度过慢、免疫原性较强等缺点，采用多种化学、生物与物理综合方法处理猪皮制备了一种新型天然胶原支架材料，通过光学显微镜、扫描电镜观察以及体外降解时间、透水汽性、拉伸强度、孔隙率、收缩温度等的测定，对其性能进行了研究。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。