听第下列材料,请回答题:The main purpose of writing these three texts is

听第下列材料,请回答题:The main purpose of writing these three texts is_________.

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患者6个月前,上前牙小洞在外院复合树脂充填后一直有冷热痛。近1周疼痛加重,不敢咬合。查:右上中切牙近中舌侧充填体完好,叩

患者6个月前,上前牙小洞在外院复合树脂充填后一直有冷热痛。近1周疼痛加重,不敢咬合。查:右上中切牙近中舌侧充填体完好,叩诊(++),扪痛(+),牙髓无活力。该患

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The noise killing system is not yet popular mainly because__

The noise killing system is not yet popular mainly because__________.

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