需要在1.5-2岁加强的疫苗是() A.糖丸 B.百白破疫苗 C.卡介苗 D.乙肝疫 发布时间:2021-03-23 10:54 │ 来源:www.tikuol.com 题型:单项选择题 问题: 需要在1.5-2岁加强的疫苗是()A.糖丸B.百白破疫苗C.卡介苗D.乙肝疫苗
题型:单项选择题 看一看,读一读,选择正确的回答。( ) 1. What are these?A. They are eggplants. B. They are beans.( ) 2. What are those?A. They are peppers. B. They are strawberries.( ) 3. Are these cabbages?A. Yes, they are. B. No, they aren't.( ) 4. Are those bananas?A. Yes, they are. B. No, they aren't. 查看答案
题型:单项选择题 已知空气的击穿电场强度为2×106V/m,测得某次闪电火花长为600m,则发生这次闪电时放电路两端的电势差U=______V.若这次闪电通过的电量为20C,则释放的电能为______J(设闪电的火花路径为直线). 查看答案