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broke had broken has broken was breaking
Is, used Is, using Does, use Has, used
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broke had broken has broken was breaking
is lost is broken has found has stopped
a; equipment the; equipments \ ; equipment \ ; equipments
一个BSC可以包含多个LA 一个LA可包含多个BSC 一个BSC必须与一个LA对应 BSC与LA没有对应关系
Is, used Is, using Does, use Has, used
La2O3+HCl La+Cl2 La(OH)3+HCl La(NO3)3+HCl
一个LA可由属于不同BSC的小区（CELL）构成 一个LA可由属于不同MSC的小区（CELL）构成 一个LA只能由属于同一BSC的小区（CELL）构成
had broken in has been broken into had been broken into has been broken in
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