减压

The ammonia was evaporated under decreasing pressure, and the precipitate was filtered off and the liquid was poured into hot saturated picric acid solution to get picrate with a yield of 85.0%. The optimum process starting from imidazole-4,5-dicarboxylic acid was: imidazole-4,5-dicarboxylic acid in acetic anhydride was refluxed to get imidazole-4-carboxylic acid, and the product was esterification in ethanol with a catalyzer of concentrated sulfuric acid to get ethyl imidazole-4-carboxylate, at last the compound above was reduced by LiAlH4 in ether at room temperature to get the target compound, the total yield of this route was 49.6%.

以4，5-二羧酸咪唑为原料的较佳工艺：1 脱羧反应：4，5-二羧酸咪唑40g，醋酐1200ml，回流10h，过滤并将滤液浓缩至干，所得固体加至50%的乙醇溶液回流，过滤并将滤液自然冷却过夜，过滤得固体；2 酯化反应：4(5)-羧酸咪唑50g，乙醇1000ml和浓硫酸60ml，加热回流2h，5%浓度NaOH溶液调节至pH＝8，减压浓缩至干，加入少量水回流，自然冷却过夜并过滤得固体；3 还原反应：LiAlH410g，乙醚300ml和4(5)-羧酸咪唑乙酯28g，常温反应1.5h，小心滴加25ml水后过滤，滤渣溶于300ml甲醇中并过滤，收集所得乙醚和甲醇滤液浓缩至干，将所得固体溶于300ml乙醇中加热回流，后将溶液浓缩至约30ml，冷却并过滤得固体，该路线总收率为49.6%。

The practical operation of the pilot plant shows this unit is compact,economic,and reliable.

中试电站调试运行结果证明该减温减压装置系统结构紧凑，运行可靠，经济合理。

Microwave vacuum distillation and ethanol as solvent are used to extract pepper oil and piperine from black pepper in this research.

采用微波减压蒸馏及乙醇提取法对胡椒油和胡椒碱的提取进行了研究。

Recurrence was classified as minor, defined as requiring a tendon transfer or an Achilles tendon lengthening, or major, defined as requiring a full posterior or posteromedial surgical release to achieve a corrected plantigrade foot.

在复发的分型上，如果患者需要肌腱移植或者是Achilles肌腱强化，则定义为小复发；如果需要完全的后路或者后中路手术减压才能达到完全矫正，则称为大复发。

Recurrence was classified as minor, defined as requiring a tendon transfer or an Achilles tendon lengthening, or major, defined as requiring a full posterior or posteromedial surgical release to achiee a corrected plantigrade foot.

在复发的分型上，如果患者需要肌腱移植或者是Achilles肌腱强化，则定义为小复发；如果需要完全的后路或者后中路手术减压才能达到完全矫正，则称为大复发。

This method is successfully applied to a problem over a horizon of one week involving 2 vessels, 6 portside tanks, 6 refinery tanks, 2 CDUs, and 6 crude oil types.

采用该方法成功求解了一个时间为1周、2艘油轮、6个码头罐、6个厂区罐、2套常减压蒸馏装置、6种原油的调度问题，表明此方法是切实可行的。

If there is a loss of cabin pressure,an oxygen mask will come down from overhead.

假如机舱内发生减压，氧气面罩将从您的头顶上方落下。

If there is a loss of cabin pressure, an oxygen mask will come down from overhead.

加入机舱内发生减压，氧气面罩将从您的头顶上方落下。

Our company specializes in producing pressure gauge, pressure reducer and instrument shell fittings, 99% of export products.

本公司专业生产压力表、减压器及仪表壳体配件，产品99%出口。

One valve is the pressure-relief valve, which prevents pressure in the tank from rising too high.

一个是减压阀，以防止油箱中的压力过高。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。