在整流电路中()输出的直流脉动最小。 ["单相半波整流","三相全波整流","三相桥式整流","单相桥式整流"]
如未发生休克,休克指数应是() ["0.1","0.5","1.0","1.5","2.0"]
凡()特种作业人员,考核发证机关应当撤销特种作业操作证。 ["复审考试不合格的","身体条件已不适合继续从事特种作业的","离开特种作业岗位6个月以上的"]
三极管的三个电极是()。 ["基极、发射极、集电极","基极、阳极、阴极","门极、阳极、阴极","门极、发射极、集电极"]
在休克监测中,哪项观察结果表示预后极差甚至死亡率可达100%() ["中心静脉压低于0.49kPa","肺动脉楔压超过4.0kPa","乳酸盐浓度超过8mmol/L","动脉二氧化碳分压高于5.33kPa","血小板计数低于8.0×1010/L"]
什么是货币的时间价值?