查询词典 volumetric flask

Filter the separated aqueous layer, wash the diphenyl ether with 5.0ml of ice-cold water, pass the washings through the filter, and collect the filtrate and washings in a 25-ml volumetric flask.

过滤已分离的水层，用5.ml的冰水洗涤二苯醚，合并滤液和洗涤液。

Decant the solution into a 200 ml volumetric flask, repeatedly rinsing the flask with n-hexane.

然后将溶液缓缓倒入一200 ml的容量瓶中，再用正己烷将上述步骤重复一遍。

Result］ It could be concluded through analyzing the model that both the mass uncertainties of quinoline phosphomolybdate precipitates and tested samples were from the resolving power and precision of balance and its maximum tolerance in assay certificate; the uncertainty brought in by volumetric flask was from the permissible error of 250 ml volumetric flask, the operation of increasing the volume to scale of volumetric flask while diluting solution and the difference between experimental temperature and the temperature at the time when the volumetric flask was calibrated; the uncertainty brought in by pipette was from the permissible error of itself, the operation of increasing the volume to intake scale while taking solution and the difference between experimental temperature and the temperature at the time when the pipette was calibrated.

结果］磷钼酸喹啉沉淀和试样质量的不确定度均来自天平的分辨力、精确度、鉴定证书上天平的最大允差，容量瓶引入的不确定度来自250 ml容量瓶本身的允许误差、稀释溶液时将体积增加到容量瓶刻度的操作和试验温度与容量瓶校准时温度的差异，吸量管引入的不确定度来自于吸量管本身的允许误差、吸取溶液时将体积增加到吸取刻度时的操作和试验温度与吸量管校准时温度的差异。

Pipette 5 cm3 of 40% formaldehyde into a 1000 cm3 volumetric flask.

将5 cm3的40%甲醛移液到一个1000 cm3容量瓶里。

ResultThe maximumabsorption wavelength of reaction solution was about 720nm.The fermentation volume,adding the activated carbonor not,pHvalue of reaction solution and so on had no great effect onthe determinationresults and they could increase the screening efficiency.The effect of ultrasonic treatment for20min was obvious.When50ml volumetric flask was used,the suitable sampling volume was 2.5ml.It was better to centrifugate the fermentationliquid and the supernatant could be taken after standing inthe determination when necessary.

结果反应液最大吸收波长在720nm左右；发酵体积、加入活性碳与否、反应液的pH值等对测定结果影响不大，在筛选时可大大提高效率；超声波处理20min效果明显；在用50ml容量瓶进行定容时，取样体积以2.5ml为宜；对发酵液进行离心效果更好些，但在必要的情况下，可静置后取上清测定。

Stock Solution— Dissolve 34 g of monobasic potassium phosphate in about 500 mL of water contained in a 1000-mL volumetric flask.

贮备液：将34g磷酸二氢钾在1000mL容量瓶中溶解于约500mL水中。

1 Place about 9.8 mL of methanol into a 10 mL ground-glass stoppered volumetric flask.

在10mL玻璃塞容量瓶中加入9.8mL甲醇。

Cool the solution, cautiously dilute with water, transfer to a 200-mL volumetric flask, dilute with water to volume, mix, and filter.

冷却解答，慎重地稀释用水，调动到200ml volumetric烧瓶，稀释用水对容量、混合和过滤器。

In volumetric analysis, we use many glass vessels such as mortar, test tube, beaker, separate funnel, grade cylinder, pipette, Erlenmeyer, buretteand volumetric flask to ground, dissolve, separate, pipe, titrate samples or dilute samples to volume.

在容量分析中，我们使用很多玻璃容器，如迫击炮，试管，烧杯，单独的漏斗，职缸，移液器， erlenmeyer滴管和容积烧瓶至地面，溶解后，就分开，管，滴定样品或稀释样本量。

In volumetric analysis, we use many glass vessels such as mortar, test tube, beaker, separate funnel, grade cylinder, pipette, Erlenmeyer, buretteand volumetric flask to ground, dissolve, separate, pipe, titrate samples or dilute samples to volume.

在容量分析中，我们使用很多玻璃容器，如迫击炮，试管，烧杯，单独的漏斗，职缸，移液器， erlenmeyer滴管和容积烧瓶至地面，溶解，就分开，管，滴定样品或稀释样本量。

I use an example quoted by Hu Jiaqi:"It is reported that America separates the DNA of a kind of virus by making use of genetic technology and combines it with another kind of DNA. Finally, they get a kind of virulent biological agent called a "pyrotoxin". Someone discloses in private that 20 grams of such a kind of biological agent could result in the global death of 6 billion people due to infection."

我在这里例举胡家奇所引用过的例子："据报道，美国利用转基因技术，将一种病毒的DNA分离出来，与另外一种DNA进行结合，拼结成一种剧毒的"热毒素"生物战剂，且私下有人透露，这种生物战剂只需20克，就可以导致全球60亿人全部感染死亡。"

Waiting, for the queers and the coons and the Reds and the Jews.

等待着疯子和黑人还有红色共产主义者还有犹太人