树上有3只鸟,现在有五棵树,请问一共有多少只鸟?
A:14
B:15
C:16
在如图所示的电路中,电源电压保持不变,当开关S闭合,甲、乙两表为电压表时,两表的示数之比U甲:U乙=5:4,则R1:R2= ____;当开关S断开,甲、乙为电流表时,两表示数之比是I甲:I乙= ____
①Jill basketball funny student number near our school only six
②is her name rose yes her name is rose