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Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.。safew官方下载对此有专业解读
，这一点在爱思助手下载最新版本中也有详细论述
…and has images like these:，详情可参考搜狗输入法下载
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（一）应税交易的购买方为自然人；