套管裂纹有什么危害性？
参考答案：套管出现裂纹会使绝缘强调降低，能造成绝缘的进一步损坏，直至全部击穿。裂纹中的水结成冰时也可能将套管胀裂。
--What do you think of the furniture on exhibition?
--Well, great! But I don’t think much of _______ you bought.
A．the one
B．it
C．that
D．which
防水闸门硐室前后两端，应分别砌筑不小于3m的混凝土护碹
