降低膨胀管技术中膨胀所需的液压力，可以更好地保护膨胀锥，获得更长的膨胀长度，提高膨胀的可靠性。
Lowering the hydraulic pressure of SET and protecting expansion cone is a key issue to achieve a longer expansion and better reliability.
降低膨胀管技术中膨胀所需的液压力，可以更好地保护膨胀锥，获得更长的膨胀长度，提高膨胀的可靠性。
Lowering the hydraulic pressure of SET and protecting expansion cone is a key issue to achieve a longer expansion and better reliability.
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