of the 2000 parents surveyed by the group, almost 60 per cent believe pupils shouldn't carry the device with them during the day, although 49 per cent were in favour of children being allowed to bring phones to and from school.

the quiet lion sleeps during the day.

那头安静的狮子白天睡觉。

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it is much hotter during the day than at night.

白天比晚上热得多。

中考真题- 2019 贵州 任务型阅读A

it's terribly hot during the day but a bit better at night.

白天太热，夜里还好受点儿。

词典精选例句

recently, our research group designed and synthesized a new type of photosensitive polymer whose chromophores were bound with cyclic acetal linkages. the property of this polymer is that the stability of cyclic acetal linkages could be controlled by adjusting the degree of z-cinnamyl chromophores via photo-isomerization.

最近，我们课题组设计合成了一种环缩醛键接生色基团的新型光敏聚合物，该聚合物具有独特的光化学调控机制，即能够通过调节肉桂基的Z-异构化程度来调控环缩醛的价键稳定性。

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synthesis and application of glycerol cyclic acetal acrylates

甘油环缩甲醛丙烯酸酯的合成与应用

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atom transfer radical copolymerization of unsaturated cyclic acetal with styrene

不饱和环缩醛与苯乙烯的原子转移自由基共聚合反应

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this sensor can measure sulfur dioxide and/ or sulfur trioxide concentrations over a wide composition range in oxidizing atmosphere.

在氧化气氛条件下，这一传感器在很宽范围内可以测定二氧化硫或三氧化硫含量。

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the maximum methane conversion of 48.5% and methanol yield of 41.5% were obtained under the conditions of 7.0 mmol catalyst, methane pressure of 3.5 mpa, reaction temperature of 473 k, reaction time of 3 h, and 50% sulfur trioxide concentration.

在工艺条件为催化剂用量7·0mmol，反应温度473K，反应压力3·5MPa，反应时间3h和发烟硫酸中SO3含量50%时，甲烷转化率可达48·5%，目的产物甲醇收率为41·5%。

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the partial oxidation of methane by the h_5pv_2mo_ 10 o_ 40 catalyst in oleum was studied. the effects of catalyst amount, reaction temperature, reaction time, and sulfur trioxide concentration on the methane conversion and methanol yield were investigated.

以H5PV2Mo10O40为催化剂，在发烟硫酸中进行了甲烷液相部分氧化，考察了催化剂用量、反应温度、反应时间和发烟硫酸浓度等工艺条件对反应收率的影响。

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p-nitrotoluene was sulfonated by sulfur trioxide to produce p-nitrotoluene-2-sulfonic acid. the factors which influence the reaction were studied, the purity of the product is above 98%, and the yield is above 96%.

以对硝基甲苯为原料，经三氧化硫磺化合成了对硝基甲苯邻磺酸，研究了影响反应的因素，主产品含量可达98%以上，收率达96%。

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the optimum conditions for synthesizing sodium cyclamate by using sulfur trioxide dioxane as sulfonating agent were investigated. the yield of sodium cyclamate is around 94.8% and the purity is more than 98.2%.

以三氧化硫·二氧六环作磺化剂合成甜味素，取得了最佳工艺条件，总收率可达94.8%，产品纯度在98.2%以上。

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this article outlines the physical and chemical property, production process, product quality standard, process parameter control and operational requirements, etc., for liquid sulfur trioxide, and discusses the technical decisions for the liquid sulfur trioxide plant.

阐述了液体三氧化硫的物化性质、生产工艺、产品质量标准、工艺参数控制及操作要求等，并对液体三氧化硫装置的技术决策进行了探讨。

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pyridine can react with halogens, nitronium fluoroborate, sulfur trioxide, boranes and chromium trioxide to form some useful organic reagents which are introduced briefly in the paper.

吡啶可以和卤素、硝基四氟化硼盐、三氧化硫、硼烷及三氧化铬反应，形成一些有用的有机试剂。

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by film sulfonation with sulfur trioxide, aromatic hydrocarbon of distillate cut oil was sulfonated, and then neutralized, extracted and concentrated to form petroleum sulfonate for the tertiary oil recovery.

采用SO＿3膜式磺化技术，磺化了石油馏分油中的芳烃，磺化产物经中和、萃取和浓缩处理，以制得符合油田三次采油要求的石油磺酸盐产品。

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the method and the technology of synthesizing heavy aromatic petroleum sulfonate by heavy aromatic hydrocarbon and sulfur trioxide and the properties of synthesized product are studied in this paper.

本文研究了采用重芳烃和三氧化硫为原料合成重芳烃石油磺酸盐的方法、工艺及产物性质。

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here is an explanation for the principles and characteristics of measuring the content of sulfide or sulfur trioxide ( so3) in cement.

阐述了测定水泥中三氧化硫含量各种方法的原理、特点等。

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it is feasible that fuming sulfuric acid sulfonating technology is substituted by sulfur trioxide sulfonating technology.

用三氧化硫磺化工艺替代发烟硫酸磺化工艺是可行的。

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the preheated system of sulfonation of sulfur trioxide

三氧化硫磺化预热系统国产化

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determination of liquid-phase sulfur trioxide in wpa slurry by icp-aes

ICP-AES测定湿法磷酸萃取料浆中液相三氧化硫含量

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summary of sulfur trioxide sulfonation model

三氧化硫磺化模型综述

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