The writer and his brother ( ) .A、sometimes see ea

The writer and his brother ( ) .A、sometimes see each otherB、never see each other

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弹性抗力就是指由于支护结构发生向围岩方向的变形而引起的围岩对支护结构的_______。

弹性抗力就是指由于支护结构发生向围岩方向的变形而引起的围岩对支护结构的_______。

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