查询词典 F test

F-test and t-test for precision and accuracy of this modified microburet as compared with the conventional buret were made and results obtained showed that no significant differences were observed, and more convenient operation was achieved by this new microburet.

通过数理统计方法，将环保型酸式自动滴定管与标称容量为50 mL的常规酸式滴定管平行测定结果进行了比较，试验证明，该滴定分析的精密度、准确度不仅与50 mL，常规酸式滴定管相当，而且操作性还优于50 mL常规酸式滴定管。

On Thursday, the navy will test an F/A-18 Super Hornet – the biggest gas-guzzler in the US air fleet – powered by a 50-50 mix of jet fuel and camelina, an oil seed grown in Montana.

周四，海军将测试1架F/A-18大黄蜂——美国机群中最耗油的家伙——动力由50对50的喷气燃料和荠（生长在蒙大拿州的一种油籽）混合剂提供。

Based on relative literatures,this part has included five resesearch aspects as below.1 Fifteen compounds were isolated and purified by extraction,column chromatography,and their structures were determined on the basis of spectral analysis: acteoside(Ⅰ-1),isoacteoside(Ⅰ-2),crenatoside(Ⅰ-3),cistanoside F(Ⅰ-4),sinapoyl-4-O-β-D-glucoside(Ⅰ-5),adenosine(Ⅰ-6),β-siterol(Ⅰ-7),oleanic acid(Ⅰ-8), succinic acid(Ⅰ-9),caffeic acid(Ⅰ-10),protocatechuic aldehyde(Ⅰ-11),p-hydro xybenzyl alcohol(Ⅰ-12),β-daucosterol(Ⅰ-13),D-galacitol(Ⅰ-14),D-mannitol(Ⅰ-15).Ⅰ-4～15 were obtained from this plant for the first time,andⅠ-6,7,9,and 13 were isolated from Orobanche genus for the first time.2 The scavenging test of DPPH showed that most compounds have comparative antioxidant activity as L-ascorbic acid and part of them show better activity such as the O.coerulescens extract and phenylethanoid glycosides.Acteoside showed potent free radical scavenging effects with a median inhibition concentration of 25.6μg/ml.3 The anti-HBV activities of acteoside,isoacteoside and crenatoside were measured,and all of them showed suppressive activity on the expression of HBsAg and HBeAg in the HepG2.2.15 cell line.

本论文在文献调研基础上对紫花列当化学成分及生物活性进行了研究，并从免疫抗病毒角度探讨紫花列当中特征性成分类叶升麻苷的肝保护作用及其机制。1采用大孔树脂、硅胶和Sephadex LH-20等色谱技术对紫花列当进行系统的植物化学研究，从中分离得到19个化合物，利用UV和NMR等波谱手段及理化性质鉴定了其中的15个化合物，分别为类叶升麻苷(Ⅰ-1)、异类叶升麻苷(Ⅰ-2)、crenatoside(Ⅰ-3)、cistanoside F(Ⅰ-4)、sinapoyl-4-O-β-D-glucoside(Ⅰ-5)、腺苷(Ⅰ-6)、β-谷甾醇(Ⅰ-7)、齐墩果酸(Ⅰ-8)、琥珀酸(Ⅰ-9)、咖啡酸(Ⅰ-10)、原儿茶醛(Ⅰ-11)、对羟甲基苯甲酸(Ⅰ-12)、β-胡萝卜苷(Ⅰ-13)、D-半乳糖醇(Ⅰ-14)和甘露醇(Ⅰ-15除化合物Ⅰ-1、Ⅰ-2和Ⅰ-3外，其余化合物均为首次从该植物中分离得到。2)通过大孔树脂富集该药材有效部位苯乙醇总苷，并采用HPLC测得其所含特征性成分类叶升麻苷的含量可达80%以上。3DPPH自由基清除试验显示紫花列当提取物及其所含的苯乙醇苷类化合物均具有较好的抗氧化能力，其清除DPPH自由基能力接近于抗坏血酸。4采用卡介苗整体致敏、脂多糖离体攻击构建大鼠原代肝细胞免疫性损伤模型，在体外观察类叶升麻苷的保肝作用。

The aim is to use rat model of formalin result to pain to observe rat praxiology responses after giving ASA , The results found that: The rats showed spontaneous pain-related responses after formalin test. After being injected formalin into one hindpaw, the rats of F group immediately showed intense pain-related response: flinching / shaking and licking / biting injected paws.

在福尔马林炎性痛动物模型测定给药后大鼠的痛行为反应，发现ASA可以明显抑制F引起的双相痛反应，故从行为学的水平确定了ASA有显著的镇痛效应。

Methods We test the cataract eyes pre-operatively apply with the scotopic blue and white flash(the intensity of which is 2.5logunit lower than that of the standard's)electroretinogram respectively,and analysis the relationship between the corrected visual acuity peripheral retinal(about 10 degree outside the macular fovea) condition 3 months post-operatively and the b wave amplitude of two kinds of F-ERG.

术前采用暗适应蓝、白光(比标准闪光衰减 2 。5 log单位的低强度光)视网膜电流图分别检查拟行白内障手术眼，将术后 3月最佳矫正视力、周边(黄斑中心凹 10°以外)视网膜状况与术前两种 F- ERG b波振幅分别作对比分析。

F In case of making use of evaporative cooling for copper ring down-lead and main lead-out line of stator coil, airproof test for both the lead-out line and connection tube is required.

f铜环引线和主引出线采用蒸发冷却方式时，引出线和连接管件的气密试验。

Test for doneness with an instant read thermometer (it should reach 165°F).

为doneness试验即时读取温度计（应达到165 ° F）之间。

Make sure you spend time with that student before she receives an F on a major paper, a test, or the class.

确保他在一次重要的作文，一次测验或者一节课中得&F&之前就花点时间在他身上。

I am here to fly developmental test and to look at the F-22 from an operational perspective.

我在这里从事研发试飞工作并从作战的角度看待F-22。

"Ricardo Traven, chief test pilot of the F/A-18 programme, the twin-engine fighter of Boeing Corp., said building the class of Tejas planes is very difficult."

&Ricardo Traven， F/A-18项目，波音双引擎战斗机的首席试飞员说，建造一架这种级别的战斗机是非常困难的。&

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。