【单选题】患者,男性,50岁,因门静脉高压症进行脾肾分流术。出院时,进行预防上消化道出血的健康指导,最重要的是
【判断题】大小、方向都随时间按正弦规律变化的电流称为正弦交流电。
【简答题】大小和方向随时间 的电流称为正弦交流电。
【单选题】What changes have happened to some families?①There are lights at home.②People like
A.
29. What changes have happened to some families? ①There are lights at home. ②People like to eat home-cooked food. ③Lots of families have computers. ④Lots of couples live apart because of unhappy problems. A.①②④
【单选题】大小和方向随时间()的电流称为正弦交流电