案例：患者，女性，32岁。因“车祸致蛛网膜下腔出血1天”入院，神志朦胧，血压、呼吸等生命体征尚稳定，未手术。入院后2天，患者留置胃管引流血性液。如对该患者进行胃液pH监测，预防应激性溃疡有较好作用的胃液pH是

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