Butt Weld and docking and corner combinations Weld, in Weld ends located arc plate and extraction plate in igniting board then leads to the welding seam, joint halfway shall weld joints in front of 2.0 mm Department Firing arc, welding pieces after preheating rod will return to weld the origin, pool filled to the required thickness, before forward welding; Welding speed : Isokinetic welding requirements to ensure weld thickness, width uniform, which masks to look for hot metal and slag bath equidistance (2-3 mm)%; Arc welding rod length : different models and determined that the general requirements of arc length is stable, acid electrode generally 3-4 mm, 2-3 mm normally alkaline electrode%; Welding perspective : According to determine the thickness of two pieces of welding, welding angle has two aspects : First, the angle between the direction of the rod and welding of 60-75 ; The second is the angle between two electrodes and welding around, the same thickness as welding, welding and welding pieces incident angle of 45 ; When the thickness ranging from welding, welding electrode and thick and thin pieces of welding electrode side angle greater than the angle between the side pieces; Arc : admission to the end of each weld should be filled crater, in the direction opposite to the direction of the back-arc welding, arc welding unchanged inside pit in 1974, to prevent the crater bite of meat.

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Fresh Alocrom 1200 coatings may be removed without seriously etching the aluminium by immersing in 50% nitric acid or in the Deoxidiser bath.

剛做的ALCOCROM 1200鍍層可以浸沒在50%的硝酸里或者脫氧劑Deoxidiser浴缸里去除鍍層A片一区二区三区视频大全，而不會明顯地腐蝕鋁材久久久久久久精品九精品。

Pearl ornaments should avoid exposure to acid-alkali substances and high temperature. they should also avoid direct exposure to perfume, hair crem and oil and salt, etc.when you wash your face and take a bath, you should take them off.

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The protein and the fatty compounds in the sample are precipitated by zinc acetate and potassium ferrocyanide, then the chromogenic reaction of acetylacetone with formaldehyde released from the sample in weak-acid medium and boiling bath takes place immediately.

提出了一種用於現(xiàn)場測定水發(fā)食品中甲醛含量的樣品快速前處理新方法，采用乙酸鋅和亞鐵氰化鉀沉淀樣品中的蛋白質(zhì)和脂肪每日更新国产，在弱酸性介質(zhì)和沸水浴條件下提取了樣品中的甲醛色88欧美日韩国产无线码，并與乙酰丙酮立即發(fā)生顯色反應(yīng)。

In this bath, maleic acid was an inhibitor, when its concentration was kept at 20 mg/L, the deposition rate could reduce to 6.17μm/h, the content of nickel decreased to 1.74% and the resistivity was 7.51μΩ·cm; Potassium ferrocyanide inhibited deposition of copper, when its content was 0.5 ppm, the deposition rate decrease to 3.38μm/h, the content of nickel was 2.03%, the resistivity can reduced to 5.41μΩ·cm, the copper deposits also had higher (111) plane orientation. Thiourea was also an inhibitor in this system, when its concentration was kept at 0.8 ppm, the deposition rate was 4.72μm/h, the content of nickel in the film was 1.20%, the resistivity can reduced to 5.46μΩ·cm, at the same time, the deposition at (111) plane orientation become more favorable.

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On the basis of electroplating and immersion plating tin, and through large numbers of experiments, a new process of electroless plating tin in acid chloride bath solutions including SnCl2 2H2O, NaH2PO2 H2O, special complexing agent, additive agent, stabilizing agent and antioxidant, was established.

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By selecting the development duration (boiling time in a boiling water bath) of the glacial acetic acid colorimetry, the sensitivity of the method is improved.

通過對冰醋酸比色法顯色時間的選擇，提高了方法的靈敏度aaa综合精品高清。