In the use of temperature range, silicate tube can be used for a long time, not easy ageing, not metamorphic avirulent insipidity, heat preservation performance for a long time.
在使用温度范围内，硅酸盐管可长期使用，不易老化、不变质无毒无味、保温性能长期不减。
According to the propagation rules of the surface cracks and the engineering practices, have been given the practical range of permissible short and long cracks on the tube surfaces.
根据表面裂纹扩展规律及工程实际，给出了管状杆件表面的实际短、长裂纹范围。
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