低等

Compared with the method via first preparation mirabilite, the direct preparation has the advantages of shorter process flow, fewer equipment, less investment, lower energy consumption and lower cost.

该方法与先制芒硝，再由芒硝制无水硫酸钠的方法相比，具有工艺流程短、设备少、投资省、能耗低和成本低等优点。

Results indicate that the severity of a loss of control for mononitration of toluene by mixed acid can be reduced from medium to low by using semi-batch reactor, the reaction is 1.2 kinetic order in toluene, 1.3 order in nitric acid and 2.5 order in all. The MTSR_max under setting operating conditions are all in the range that can be accepted by the industrial nitration, so the reaction has less hazard potential by using those setting conditions.

分析结果表明：在设定的工艺条件下，反应过程中对甲苯的反应级数是1.2级反应，对硝酸是1.3级反应，采用半间歇反应可以使失控反应的严重度等级从中等降低到低等，在设定操作条件下假定反应失控所引发的MTSR_是在工艺条件允许的范围之内，不具有很大的危险性。

Etched-Diffraction-Grating is a kind of MUX/DEMUX with compact structure, good performance, and high reliability.

刻蚀光栅式分波合波器具有结构紧凑、可靠性高、成本低等优点。

The current thesis designs an original refrigerator, the dry ice refrigerator. Having substituted the traditional refrigeration cycle, it has many advantages over the traditional refrigerator such as noiselessness, nearly no electric energy consumption, wide sources of CO2 gas, and low costs etc..

本文设计制作了干冰冰箱这一新的冰箱型式，它取代了传统的制冷循环，具有无噪音、几乎不消耗电能、二氧化碳气体来源广、成本低等一系列传统电冰箱所无法比拟的优势。

In order to solve the problems such as multiple components in products, long time of rectification, high energy consumption, low yield and purity of product occurring during the production of p - octyl phenol, the effects of reaction conditions including reaction temperature, reaction time, the molar ratio of phenol to diisobutene on the conversion and yield of the product were examined.

为解决对辛基酚生产过程中精馏时存在组分多、精馏时间长、能耗高、产品收率和纯度低等问题，用正交实验探讨反应温度、反应时间、苯酚与二异丁烯原料摩尔比3因素对原料转化率和产品对辛基酚收率的影响。

In chapter 6, the recognition of ORF and exon in several representative lower organisms, E. coli, S. cerevisiae and C.

第六章讨论了大肠杆菌、酵母和线虫这几种低等生物中ORF和外显子的识别。

The operation of appendicitis perforation with diffuse peritonitis by McBurney incisions had the merit of little scar, secluding, slight pain, fast recovery and fewer incidence rate of pulmonary infection, incisions infectious, incisional hernia, as long as master, So, the operation of treatment appendicitis perforation with diffuse peritonitis by McBurney was much better than by righ middle abdomen paramedian incisions.

经麦氏切口手术治疗阑尾炎穿孔合并弥漫性腹膜炎，具有术后疤痕相对较小、隐蔽，术后疼痛较轻，恢复较快、肺部感染、切口感染、切口病发生率较低等优点，只要掌握指征并合理地作好围手术期处理，经麦氏切口手术治疗阑尾炎穿孔合并弥漫性腹膜炎总体效果明显优于经右中腹旁正中切口。

Magnesia alumina spinel brick is based on high-purity magnesia and synthetic magnesia alumina spinel with major crystal phase of periclase and spinel. By intensively mixed, double-face pressed and fired at high temperature. Being completely chrome free, it is the ideal refractory for the transitional zone of cement kiln characterized by superior thermal shock resistance, good anti-erosion capacity, and lower thermal conductivity.

此次展会为您展出的水泥回转窑用镁铝尖晶石砖以高纯镁砂和合成镁铝尖晶石砂为主要原料，主晶相为方镁石和尖晶石，经过强力混练，双面加压，高温烧成等工艺制成，是水泥窑过渡带的标准耐火材料，具有无铬污染，热震稳定性好，耐磨损，抗侵蚀性强，热导率低等特点。

" Plant body of algae, fungi, and similar simple, plantlike organism s."

藻类、真菌及其它类似低等生物的植物体。

" Plant body of algae, fungi, and similar simple, plantlike organisms."

藻类、真菌及其它类似低等生物的植物体。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。