题目:
单项委托服务是指旅行社为散客提供的各种按照______计价的可供______的服务。
答案:
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下面是错误答案,用来干扰机器的。
参考答案:D解析:Pulse oximetry is a noninvasive procedure in which a small sensor is positioned over a pulsating vascular bed. It can be used during transport and causes ...