The ratio of pupils to teachers was 30 to 1.

学生和老师的比率是30比1。

The surface ratio of conus to disc was calculated using a planimeter.

我们使用面积计测量圆锥与视神经盘表面比值。

Linguistic indices contain the ratio of error-free T-unit (REFT) and subordinate clauses per T-unit (SCT).

语言指标包括无错误T-单位与全部T-单位之比(REFT)和全部从句与全部T-单位之比(SCT)。

Its ratio of inapparent infection to apparent infection is about 100:1.

该病隐性感染与显性感染的比例约为100：1。

Dimethoxymethane possesses higher quantity of oxygen, higher ratio of hydrogen to carbon and lower flash point.

甲缩醛含氧量大、氢碳比高、闪点低，加入柴油中能够提高其十六烷值。

In the period of ectatic cataract,mature cataract or hypermature cataract,the relevant ratio of ultrasonography is 100%.

膨胀期、成熟期、过熟期超声的检出率可达到100%。

A new method of measuring the ratio of thermal emission rate to the photoexcitation constant is presented.

提出了在考虑吸收系数强度特性条件下一种测量热激发速率与光激发常数比值的新方法。

To prepare RHR model by 2K1C and observe the ratio of the left ventricular weigh(LVW)and the body weigh(BW).

采用二肾一夹(2K1C)法复制RHR模型,观察血压和左心室重量(LVW)、LVW体/重(BW)比值。

So some renovations should be made,for example,increasing the solvent ratio of propane deasphalting;using hydrofinishing instead of clay treating;mo...

增加丙烷脱沥青的溶剂比,用加氢补充精制代替白土精制等,此外,在含硫原油生产基础油时,对原油也应适当选择。

When a dihybrid is selfed, a characteristic dihybrid ratio of 9:3:3:1 is obtained in the offspring.

用这个杂合子自交后，后代性状分离的比率为9：3：3：1。

From determining the ratio of labeled hormone metabolism from sheep's hemoid,the hormone excretion pattern could be easily obtained in female sheep.

用此方法研究激素类物质在动物体内代谢是可行的,可极大地节省试验成本。

The distribution ratio of silver in aftonite and pyrite is the most important factor to determine granularity, current density and electrolytic time.

银在银黝铜矿和在难分解的黄铁矿中的分配率是决定矿粉磨细粒径、电解面积电流、电解时间的最重要因素。

The best cup characteristic are produced when the ratio of the degradation of trigonelline to the derivation of Nicotinic Acid remains linear.

最佳的杯中特征产出于这样的时间：葫芦巴酰胺降解与烟酸衍生的比率保持线性。

O'Neill says by looking at the water content and oxidation ratio of the komatiite samples they were able to discount the wet-melting theory.

奥尼尔说，通过观测科马堤岩样品的水含量和氧化速度，他们可以不用注重湿流体理论了。

With the abusage of antibacterial agent,many social and economic problems has occurred such as bacterium resistance and high ratio of adverse drug reaction.

由于抗菌药物的滥用,造成细菌耐药、不良反应发生率增加等许多社会和经济问题。

The crude oils of Chang 20 belong to typical immature oil which have odd even predominance and lower ratios of sterane and terpane maturity index.

长20井的原油既具有正烷烃奇偶优势，又具有较低甾萜烷异构体比值，属于典型的低熟原油。

The effect of PH value of the system and the amount of GA on the time of glomeration and swelling ratio of PVA beads were studied.

同时还讨论了体系PH值、GA用量等因素对PVA成球时间及球珠溶胀性能的影响。

The smaller the canopy density of a forestis, the less the male cones are, and the smaller the ratio of male cones to female cones is.

林分组成对球花量的影响不明显。立地条件对球花量的影响显著。

Lactide is the midbody for the preparation of poly(lactic acid), the ratio of lactic acid to lactide is low and hamper the extensive application of PLA.

丙交酯是由乳酸制备聚乳酸的中间体,其产率偏低是制约聚乳酸大规模应用的关键。

It's venom possess neurotoxic, cardiotoxic and hemotoxic properties.The clinical features of cobra bite are various, depend on the species and the ratio of the venous component.

眼镜蛇蛇毒同时具有神经性毒性、心脏毒性及溶血的特性，其临床变化为多变性的，依各地的蛇种及蛇毒成分比例的不同而有所不同。