休克时产生的体液因子是() ["A．儿茶酚胺","B．组胺","C．血栓素a","D．前列腺素","E．以上都不是"]
抢救青霉素过敏性休克的首选药物是() ["A．肾上腺皮质激素","B．阿托品","C．肾上腺素","D．多巴胺","E．西地兰"]
关于酸中毒对微循环的作用，下列哪项叙述正确() ["A．使微静脉，小静脉收缩","B．使微静脉，小静脉扩张","C．使微动脉和毛细血管前括约肌收缩","D．使微动脉和毛细血管前括约肌扩张","E．对微动脉、微静脉、毛细血管无影响"]
机体急性失血量超过全身血量多少时，即可引起失血性休克() ["A．5%","B．10%","C．15%","D．20%","E．25%"]
通常机体急性失血量最高为全身血量多少时，可通过机体代偿而不出现症状() ["A．5%","B．10%","C．15%","D．20%","E．25%"]
背景:
