During the air pressure test, the test temperature shall be higher than the brittle transition temperature of the metal material.
气体压力的试验时，试验温度必须高于金属材料的脆性转变温度。
After low temperature test, the sample does not appear breaks or brittle fracture.
光纤槽道能承受低温试验。 试验后，试样不产生裂痕或脆断；
After low temperature test, the sample does not appear breaks or brittle fracture.
光纤槽道能承受低温试验。 试验后，试样不产生裂痕或脆断；
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