If solvents , such as thinner and benzene ,or substance containing such solvents come in contact with the watch ,discoloration ,melting, cracking etc, may result .
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Measures were taken to prevent welding cold cracking such as improve welding technology by decreasing cooling speed and adopting low-hydrogen electrode, etc.
通过改进焊接工艺来降低冷却速度和采用低氢型焊条等措施来控制焊接冷裂纹的产生。
The creature oil is a fuel of environmental protection, it is produced with straw material, using the crafts of the hot cracking and liquefying etc.
生物质油是用秸杆作原料，通过热裂解、液化等工艺而生产的环保型燃料。
The results showed that under certain condition, the trend of the properties of Kaolin Clays, such as surface area, pore volume, pore size distribution and cracking activity etc.
在不同的温度、时间、酸浓度等条件下，用不同的无机酸对高岭土进行改性处理，考察其改性后的比表面、孔容、孔径分布及裂化活性的变化。
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