查询词典 pitch ratio

In filicophytes, there was a relatively high ratio of VA mycotrophy in the eusporangiates, and there was no autotrophic in the eusporangiates; but the ratio of autotrophic was up to 71%, and the ratioes of VA mycotrophic and facultative mycotrophic were low, 15% and 14% respectively in the leptosporangiates.

用碱解离、酸性品红染色法对云南热带、亚热带自然生长和部分移栽到温室中的256种（拟蕨类植物20种，真蕨类植物236种）蕨类植物孢子体的VA菌根状况进行了调查研究，结果发现，在拟蕨类植物中，孢子体只存在兼性VA菌根营养和自养两种菌根营养类型，两种类型，两种类型所占的比例相当；在真蕨类植物中，厚囊蕨类植物VA菌根营养的比例较高（92%），且无自养类型；而在薄囊蕨类植物中，自养型占71%，VA菌根营养和兼性菌根营养所占的比例都不高，分别是15%和14%。

Effects of the pretreatment of catalysis, reaction temperature, the ratio of the reactants, the substrate-catalyst ratio and the content of the promoter on the reaction properties of NaK catalysts has been studied in a wide range.

本实验用超声波技术激活金属钾钠合金低共熔物催化剂，考察了催化剂预处理，反应温度，原料配比，催化剂用量以及加入助剂用量等因素对钾钠液态低共熔物催化剂上邻二甲苯与1，3-丁二烯合成OTP反应转化率的影响。

The results show that the best second extraction condition for naringenin was as follows: 7:3 for concentration ratio of methanol and ethanol, 50 for temperature, 5 h for time, and 1:45 for stuff and liquor ratio.

通过实验确定了柚皮素的最佳二次提取条件为乙醇甲醇浓度比7：3、温度为50℃、时间为5h、料液比为1：45，采用分光光度法测得柚皮素平均得率为5.25%。

According to the geology and well test data of Neopaleozoic tight reservoir in Tabamiao region, we begin with the conventional log response characteristic analysis and extract the classification ratio parameters to visual identify and evaluate reservoir characteristic. That is the lithologic, electric and physical ratio parameters and gas synthetical characteristic exponent.

依据塔巴庙区块上古生界致密储层各种地质、试井成果等的资料，从常规测井响应特征分析入手，提取建立了一套直观识别评价储层特征的分类比值参数，即&四性&测井特征参数：岩性比值参数、电性比值参数、物性比值参数和含气综合特征指数。

The ratio of nitridation increases as the temperature does and reaches the uppermost at 1:2.5 for the ratio of titania to carbon.

随着温度的升高，氮化率呈递增的趋势；而对于TiO_2／C的影响，本文发现TiO_2／C为1：2.5时系统的氮化率最高。

Except for benzene, hexane, nonane and heptane, the DVP pass ratio values are 77.8%-100%, the DP pass ratio valutes are 66.7%-100%, when sampled 29 other VOCs, which meet the demand for method TO-17 basically.

除了正己烷、正庚烷、苯和正壬炕，以该型采样管采集分析空气中其他29种非卤代烃类VOCs时，其DP合格率为77.8%-100%，DVP合格率为66.7%-100%，基本满足方法TO-17的要求。

Under the condition of varying , the ratio between noise levels in local sensors, this dissertation derives the analytic expression of performance of the centralized OS-CFAR detection for and local signal-to-noise ratio in nonhomogenous background.

本文在局部传感器背景噪声功率水平间的相对比例系数变化情况下，推导出了集中式 OS-CFAR 检测在且局部观测信噪比条件下在非均匀杂波背景中检测性能的解析表达式。

The improved pretreatment comprises choosing either a feedstock with a ratio of arabinoxylan to total nonstarch polysaccharides of greater than about 0.39, or a selectively bred feedstock on the basis of an increased ratio of AX/NSP over a starting feedstock material, and reacting at conditions that disrupt the fiber structure and hydrolyze a portion of the cellulose and hemicellulose.

该改良的预处理方法包括选择一种其阿拉伯木聚糖与总非淀粉多糖的比率大于0.39的原料，或一种基于其AX／NSP高于初始原料而选育的原料，并在破坏其纤维结构及将纤维素与半纤维素部分水解的条件下反应。

ThE ratio(234Th-derived export production/Primary production ratio) in the northern SCS varied in the range of 4-68%,with an average of 24%,which was higher than the tyical value in the oligotrophic ocean(＜10%).

综合分析南海与其它不同纬度陆架边缘海的生物泵效率，发现ThE均出现显著季节变化，高输出通量季节的ThE是其他季节的2—3倍。

The results indicate that only tungsten oxide grains are formed without sodium sulfate additions, while tungsten oxide whiskers with 0.20.3 μm in diameter and aspect ratio of 5-50 or tungsten oxide nanowires with 1030 nm in diameter and aspect ratio of 50200 are synthesized by some sodium sulfate additions on conditions at 180 ℃ for 1236 h. The phase composition of tungsten oxide whiskers is hexagonal tungsten trioxide. The whiskers/nanowires grow oriently through 〈200〉,〈002〉,〈202〉and〈100〉.

结果表明：未添加硫酸钠时，在180 ℃水热反应12~36 h只能得到氧化钨颗粒粉末，而添加适量硫化钠后，可制备出直径为0.2~0.3 μm、长径比为5~50的氧化钨晶须和直径为10~30 nm、长径比为50~200的氧化钨纳米线；氧化钨纳米线晶体结构良好，物相为六方晶系WO3；微/纳米氧化钨晶须/线主要沿〈200〉，〈002〉，〈202〉和〈100〉方向定向生长。

After oxidation, pH value of the surface of carbon black has a specific relation with the volatile content.

氧化后炭黑表面的pH值与挥发分之间有一定的关系。

Knowing that such a person is warped and sinful; he is self-condemned.

因为知道这等人已经背道，犯了罪，自己明知不是，还是去做。