【简答题】用天平称次品时,把下列数量的物品(每组只有一个次品)分成3份,怎样分称的次数最少.(写过程)
【简答题】Jack London was usually considered as a romanticist for his portrayal of superman heroes.
【单选题】如图所示,电源电压为 6V , 内阻不计。 闭合开关后,电压表的示数为 4V ,下列描述不正确的是( )
【简答题】用天平称次品时,把下列数量的物品(每组只有一个次品)分成3份,怎样分称的次数最少.