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Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.

缩醛类化合物是近几年发展起来的高档新型香料，在日用香精和食品香精中有广泛应用。

In the recent decade, more and more attention has been paid to the roles of acetylation in transcription regulation.

尤其是近十多年来，乙酰化在真核生物基因表达调控中的作用日益受到人们的关注。

Achene 1, subglobose, with thin coat, enclosed in hypanthium.

Achene 1，近球形，带有薄的外套，在托杯里随函附上。

Leaves 3-veined. Male perianth lobes 4(or 5), valvate; female perianth lobes 4, subequal, shorter than achene.

叶3脉。雄花花被裂片4(或5)，镊合状；雌花花被裂片4，近等长，短于瘦果。

One-third of China's land area is affected by acid rain.

同时，中国已近1/3的国土被酸雨污染。

In recent years, L-lactic acid cause a wide range of research and development interest.

近几年来，L－乳酸的研究与开发引起人们广泛的兴趣。

The acidophilic granules in the proximal convoluted tubule of the kidney in Tilapia nilotica were studied by electron microscopy, enzyme histochemistry and enzyme cytochemistry.

用电镜和酶组织化学技术探明了尼罗罗非鱼肾近曲小管细胞嗜酸性颗粒的结构实质、来源和存在意义。

In this dissertation, the key technologies in the development of the CAD/CAM software based on ACIS geometric engine are studied in depth.

计算机辅助设计与制造技术是近30年来迅速发展起来的新技术，是现代制造技术的重要组成部分。

In order to reduce calculation in the process of vertical scale identification of torpedo acoustic image,we present an improved decoherent multiple signal classification method based on quadrature complex sampling which suits to estimating the vertical highlights of submarine with the characteristics of near distance and coherent signals .

在鱼雷声成像垂直尺度识别中，根据潜艇垂直方向上目标亮点相距较近，且为相干信号源的特点，同时为了减小运算量而易于工程实现，提出了一种基于正交采样的高分辨DOA估计算法，即正交解相干MUSIC算法。

The surface acoustic wave can disperse when the material properties of near-surface change.

材料近表面性质的变化能够导致在其中传播的声表面波发生色散。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。