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.
试验后取出试样，检视试样表面是否产生龟裂、裂痕。
Finally, take out of specimen for checking whether its surface has crack or fissure or not.
试验后取出试样，检视试样表面是否产生龟裂、裂痕。
Finally, take out of specimen for checking whether its surface has crack or fissure or not.
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