There are options to set message delivery mode, priority and time-to-live value.
有几种选项可以设置消息发送模式，优先级和存活时间值。
Objective to investigate the social factors on the impact of mode of delivery options.
目的探讨社会因素对分娩方式选择的影响。
Objective to investigate the social factors on the impact of mode of delivery options.
目的探讨社会因素对分娩方式选择的影响。
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