把6根黄瓜放到4个盘子里,至少有( )根黄瓜放进同一个盘子里。
2
(1)已知a= 3 cm,b= 60 mm,c= 4 cm,试求a、b、c的第四比例项d;
(2)已知a=4cm,c= 9 cm,且a、b、c是成比例线段,试求线段b的长;
(3)已知线段a= 2 cm,b = 30 m,c = 6 cm,d =10cm,试判断它们是否为成比例线段?
A(n) _____ of achievement clearly has an influence on children’s early education.
A.idea
B. sense
C.need
D.mind