下列情况哪项不是肠内营养滴注过程中应注意观察的内容（） ["A、呛咳、呼吸困难、恶心、呕吐","B、检查胃内残留量","C、观察大便性质、肠呜音、腹胀情况","D、定时检测血糖、电解质情况","E、听力"]
机车信号测试环线电缆额定工作电压（）V以上。 ["110","250","360","380"]
变压器纵联差动保护也可以在保护变压器绕组及其套管、引出线上发生（）短路时起保护作用。 ["单相接地","两相","三相","相间"]
机车信号测试环线使用多股铜质非铠装或非屏蔽护套电缆，芯线截面积不小于（）mm2，。 ["4","6","8","10"]
问歇滴注肠内营养液，要求每次输注的持续时间为（） ["1O~20min","30~60mJn","60~90min","2min","2min以上"]
不定期票与定期票的区别？
