柱

Separation effect and retention time of organic acids could be improved byreducing pH values of the eluent and column temperature.

降低流动相的pH，可有效抑制有机酸分子的解离，延长保留时间，提高有机酸的分离效果，但流动相的pH不应低于2.0，否则会导致色谱柱填料的水解，损坏色谱柱。

D., 5 μm. The flow rate was set at 0.8mL/min and the eluent was detected at 340 nm for the four flavonoids.

选择Venusil ASB C18色谱柱(150 mm×4.6 mm，5μm)，流速为0.8 mL/min，检测波长为360 nm，柱温为35℃。

The eluents were water, 10%, 20 %, 30 % and 50 % ethanol respectively and they flowed through the macroporous resin one by one with five times of the column volume. The obtained eluent of 50 % ethanol was evaporated and the content of total flavonoids was 76 % measured by HPLC.

结果 选择AB-8大孔树脂；最佳纯化工艺为上样液总黄酮质量浓度 60 mg·L-1，pH 5.0，温度 25 ℃；最佳洗脱方式是用5倍柱体积的水及体积分数分别为10 %、20 %、30 %的乙醇依次洗脱，弃去洗脱液后再用5倍柱体积的体积分数为50 %的乙醇洗脱；HPLC法测定总黄酮的含量为76 %。

In the upstroke, fluid pressure in the plunger acts on inner surface of expansion sleeve and makes it expand outward, keeping the seal ring press on the inner wall of pump barrel to form good sealing.

上行程时柱塞内部的流体压力作用到胶套内表面上使之向外膨胀，使密封环始终压在泵筒内壁上，形成良好的密封；下行程时弹性伸缩套恢复原状，柱塞和泵筒之间产生间隙。

Our leading products, i.e., motorcycle brake disc, automatic slack adjuster and engine tappet have been in the world widely recognized. Air disc brake and electromagnetic fan clutch has successfully launched in the market. These products are marketed and distributed in Asia, Europe, North America and South America. We are one of the largest manufacturers and exporters of motorcycle brake disc, automatic slack adjuster and engine tappet in China.

集团主导产品两轮摩托车制动盘、汽车制动间隙自动调整臂、发动机气门挺柱均已成为国内外知名品牌，盘式制动器、电磁风扇离合器产品也成功推向市场，产品畅销亚洲、欧洲、美洲等几十个国家和地区，是国内最大的两轮车制动盘出口基地、国内最大的发动机气门挺柱和汽车制动间隙自动调整臂生产商。

Our leading products, i.e., motorcycle brake disc, automatic slack adjuster and engine tappet have been world widely recognized. Air disc brake and electromagnetic fan clutch has successfully launched in the market. These products are marketed and distributed in Asia, Europe, North America and South America. We are one of the largest manufacturers and exporters of motorcycle brake disc, automatic slack adjuster and engine tappet in China.

集团主导产品：两轮摩托车制动盘、汽车制动间隙自动调整臂、发动机气门挺柱均已成为国内外知名品牌，盘式制动器、电磁风扇离合器产品也成功推向市场，产品畅销亚洲、欧洲、美洲等几十个国家和地区，是国内最大的两轮车制动盘出口基地、国内最大的发动机气门挺柱和汽车制动间隙自动调整臂生产商。

Based on self-made stepping arc stud welding gun, the welding process adopting ferrules as arc shield was studied.

利用自行研制的步进式电弧螺柱焊枪，采用套圈作为焊接过程的保护方式，研究了套圈保护步进式电弧螺柱焊过程。

Gather the necessary installation tools: you will need a column cutter, column nuts, ferrules, a magnifying loop, and typewriter correction fluid.

收集必要的安装工具：柱切割器、柱螺母、垫圈、放镜、打字机改正液。

Ceramic ferrules are specially designed for various stud welding.the products are made from cordierite which is ideal material and applied in shipbuildong industry,heavy construction fields,ect.

ceramic ferrules for stud welding 螺柱焊陶瓷环是各种类型螺柱与钢铁基体焊接时的保护定型环，由体质堇青石原料制成，广泛用于造船，桥梁制造，重型工业等领域。

Gather the necessary installation tools: you will need a column cutter, column nuts, ferrules, a magnifying loop, and typewriter correction fluid.

mM5}F B7sH0 收集必要的安装工具：柱切割器、柱螺母、垫圈、放大镜、打字机改正液。

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。