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The method has been used to determine Phthalic esters in drinking water and seawater sample. 3. Single drop microextraction, followed by gas chromatography with flame ionization detection has been applied to determine Formaldehyde, Acetaldehyde and Acraldehyde in water based on 2,4-Dinitrophenylhydrazine derivatization. Extraction solvent, extraction time and stirrer speed were optimized. Optimal experimental conditions were as follows: 1.6μL toluene microdrop exposed for 30 min in a 3ml aqueous sample placed in 4ml vial and stirred at 600 rpm/min.

以2，4-二硝基苯肼衍生，单滴液相微萃取与气相色谱火焰光度检测器联用测定水样中的甲醛、乙醛、丙烯醛，考察了萃取溶剂、液滴大小、萃取时间、搅拌速度、盐效应等对该方法的影响，并对影响液相微萃取的各种因素进行了系统的阐述，确定了该体系的最佳实验条件，实现了甲醛、乙醛、丙烯醛的提取和富集。

Click the Modify button and choose the required action from the drop-down list of actions.

点击修改按钮，然后从下拉列表中选择需要进行的操作。

To 31, 1996. Using a drop size meter and ADAS, soundings of microphysical structures of radiation fog and soundings of vertical distributions of some related meteorological elements, such as temperature, pressure, moisture, wind and so on were conducted.

利用三用滴谱仪和ADAS对辐射雾的微物理结构及温、压、湿、风等要素的垂直分布进行了探测。

We could add additional code to get the selections from the drop-down boxes too.

我们能添加额外的代码来从下拉框里获取选择。

Introduces and analyses the calculating softuare of steam parameters and enthalpy drop of adiabatic expansion.

介绍与分析水蒸汽参数和绝热膨胀焓降的计算软件。

Using pure air as working substance, the temperature drop between the inlet and the out gases is 63.6 K and the adiabatic expansion efficiency higher than 40%is achieved.

利用空气作介质，系统进出口湿降为63.6K，绝热膨胀效率可达42％。

Q: I would like to install the ADSL, but worried that the quality will drop calls.

问：我想安装ADSL，但是担心电话质量会下降。

When adulterated with boron atoms the electric resistance of diamond will drop and it will become a kind of semiconductor.

当金刚石中掺入硼原子后可使其电阻率下降，成为典型的半导体材料。

Ma Ying also pointed out that although oil prices have fallen over the highest point, but Air China will be difficult to enjoy the benefits of lower oil prices, mainly due to the original Air China by the international price of oil procurement Make up for the decline in hedging losses (of the decline in procurement costs higher than the loss of security units) in order to benefit from a decline in the price of crude oil, but because of the signing of contracts, including the other party has the right to determine in advance in accordance with the agreed price of the company to sell a certain number of cycles of Fuel, so the amount of losses may be higher than the drop in oil prices brought about by the decline in costs.

马英九还指出，虽然油价已经下跌了最高点，但航空公司中国将难以享受油价下跌带来的好处，主要是由于国际石油价格在原中国航空采购弥补在对冲损失（在采购成本比更高的安全部队损失下降）下降，以受益于原油价格下跌，但由于所签订的合同，其中包括对方已按照事先确定的权利，与公司商定的价格出售了一定数量的燃料循环，所以损失的金额可能低于石油价格下降所增加的成本下降带来的。

It is reported that domestic steel mills have agreed with Rio Tinto chief in accordance with the Association last year, 6.7 fold in advance the price of iron ore price, as Nippon Steel and Rio Tinto iron ore reached a comprehensive long-HS price drop about 33%, the fluid control experts believe that a senior, this means that Rio Tinto approved in disguise starting price, but the China Steel Association has always stressed that China will not follow the initial price of Rio Tinto.

据悉，国内已有钢厂同意力拓按照去年长协价格6.7折预付铁矿石货款，由于新日铁与力拓达成的铁矿石长协价格综合降幅约33％，因此资深流体管专家认为这等于变相认可力拓的首发价，但中钢协一直强调，中方不会跟随力拓的首发价格。

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"