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But the one step method that taking propene and hydrogen bromide as material synthesized 1-bromopropane was low cost, obtaining high-purity product ,and it's production process has no pollution to environment. One step method be deemed to the optimum method.

而以丙烯和HBr气体一步直接合成1-溴丙烷的方法成本较低，所得产物纯度较高，且其生产过程对环境是绿色的，可以说是生产1-溴丙烷的最佳方法。

Also, in this method, anhydrous hydrogen fluoride, from which moisture was removed by treating with F.sub.2 gas, is used in the steps and, and the step further comprises contacting the reaction system of the step with F.sub.2 gas.

同时，在此方法中的步骤和步骤还使用了经过氟气（F.sub.2 gas）除湿的无水氟化氢，而且步骤中还包括了其反应系统与氟气的接触。

An alternative way of the synthesis of methanol from syngas is low-temperature methanol synthesis via methyl formate in liquid phase, namely, carbonylation of methanol in the first step, and hydrogenolysis of methyl formate in the second step.

低温液相甲醇合成是指在（80-160℃）范围内，甲醇首先与合成气中的CO发生羰基化反应生成甲酸甲酯，甲酸甲酯再氢解生成甲醇的两个反应在一个反应器内串联进行的方法。

Preparation of ZnO micro-nano composite hydrophobia film via three-step method ;2. In this paper basic steps of structural dynamic damage detection are discussed and a three-step method for structure damage diagnosisis proposed.

以位于广东新会的崖门桥(双塔刚构体系预应力单索面混凝土斜拉桥)为工程背景，探讨了结构动力损伤识别的基本步骤以及利用结构动力损伤识别三步法对大型工程结构进行损伤识别的有效性。

This article uses the step-by-step Fourier method and normalized NLSE was solved, and analog input for the first-order,second-order and third-order hyperbolic secant optical pulses under the conditions of the evolution of optical pulse transmission.

本文使用了分步傅里叶方法对归一化NLSE 进行了求解，并模拟了输入为一到三阶双曲正割光脉冲条件下光脉冲传输演变情况。

In every step plastic hysteresis energy was calculated, and the result showed it increased by the step.

对各级塑性滞回能进行了计算，发现塑性滞回能随着级别的增高而增高，并对其进行了拟合。

Choice behavior demand characters were studied by in-depth survey step by step. Gradually impellent park and ride choice behavior SP questionnaire survey procedure and analysis method were put forward.

通过逐步递进的方式层层深入的解析停车换乘的选择行为需求，提出了递进式停车换乘选择行为 SP 调查流程和分析方法，研究了停车换乘选择行为特征。

Face recognition system, you need to step by step in accordance with the menu can be achieved recognition!

人脸识别系统，你需要按照菜单一步一步才能实现识别！

Step 1 - This is the most important step in my work.

步骤1 --这在我的工作中是最重要的步骤。

Go step by step into an ancient Incan civilization to find the lost city of El Dorado, a city hidden in the Amazon jungles!

去一步一步地成为一个古代印加文明，找回失去的城市埃尔多拉多，一个城市隐藏在亚马逊丛林中！

I've been very happy with our attacking play and I think Louis Saha is benefitting from playing regularly.

我对我们的攻击力感到满意，我认为Louis Saha正从正规的比赛中获益。

Ensure that bolts of correctleng th are sele cted, the bolts must not touch the brake disc when

确保使用正确长度的螺丝，当螺丝完全收紧的时候不能触到刹车碟。