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An orthoganal design with four terrain factors under two levels was carried out to systematically analyze the law of variation on diameter, height and trunk's basic volume weight of 13-year-old Alnus cremastogyne from plantation.

摘 要:本文应用四个地形因子在两个水平下的正交试验设计方法,系统分析了13年生桤木人工林胸径和树高生长以及树干公定容重的变化规律。

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。

Therefore, it was needed that the good state of GC instrument and precise operation in two forementioned procedures for decreasing measurement uncertainty.

因此,为降低检测结果的不确定度,首先保证仪器良好的工作状态,并且在分取提取液和定容溶液时需尽可能操作精确。

It is shown that the generation of the PA effect results from two kinds of contribution only. One is the contribution of so called"thermal piston"--the gas boundary layer adjoining the heated sample which expands cyclically and pushes the rest gas just like piston. The compressing process of it is comfirmed to be isochoric. And the other is that of"mechanical piston"--the thermally expansive sample itself, the compressing process of which is found to be polytropic with a index of (2-〓).

一即是被称为&热活塞&的与材料受热表面相邻的边界层气体周期性热膨胀产生的压缩,其是定容过程;另一是被称为&机械活塞&的材料本身热膨胀产生的压缩,其是多变过程,多变指数为2-〓,γ为绝热压缩因子。

Sulphuric acid and 10 Kjeldahl catalyst tablets to 200 ml of distilled water.

在500ml 容量瓶中加入200ml 蒸馏水,然后小心加入50ml 浓硫酸和10片凯氏消化催化剂片,冷却后定容

According to the character of condensate gas and the injected dry gas inside the UGS based on condensate gas reservoirs, the paper puts forward a mathematical model of multicycle working inventory for constant volume and weak waterbearing condensate gas reservoir by the mixed fluid density calculation method with molar volume balance and the gas equation of state.

为此,针对凝析气藏型地下储气库库内凝析气与注入干气混气的特点,从库存量的定义入手,利用摩尔体积权衡混合流体密度计算方法和气体状态方程,提出了定容和弱边底水凝析气藏型地下储气库多周期运行系列盘库计算的数学模型。

The low temperature sensitivity coefficient effect of high energy nitroamine propellant through the closed vessel and interior ballistic experiments is studied.

通过高压密闭爆发器试验,研究了低温感高能硝胺发射药的定容燃烧特性,分析比较了其包覆前后的燃面变化规律。

The analysis and experiment results of spark igniting premixed laminar combu stion of CH4/Air/Diluent charge in a constant-volume combustion bomb have bee n des cribed.

介绍并分析了甲烷-空气-稀释气混合气在定容燃烧弹内进行火花点火预混层流燃烧的试验结果。

Interactions and applications between gold nanoparticles and proteinsThe AuCl_3 solution was reduced by trisodium citrate under vigorous stirring at boiling for 15 min and cooled to ambient temperature.

在搅拌过程中缓慢加入修饰剂硫辛酸,冷却至室温后离心、洗涤、定容,再加入嗅标记蛋白OMP,在37℃条件下水浴8h,可制得与OMP结合的金纳米颗粒。

Fresh carrot, tomato and chili were used as test samples, absolute alcohol were used in process of triturating and dehydrating, acetone were used for extraction, all of the alcohol solution and acetone solution were commixed, and the content of β-carotene were directly determined by HPLC.

选用胡萝卜、番茄和红辣椒三种常见新鲜果蔬作为供试品,采用无水乙醇匀浆、脱水,丙酮提取-直接定容的方法制备供试品溶液,使用高效液相色谱法测定供试品中β-胡萝卜素的含量。

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推荐网络例句

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊!不用提了。提到肉,真是糟透了。

Tristan, I have nowhere to send this letter and no reason to believe you wish to receive it.

Tristan ,我不知道把这信寄到哪里,也不知道你是否想收到它。