单项选择题
A.20m,10m,5mB.50m,20m,5mC.50m,40m,10mD.50m,20m,10m
A.≤5cm,≤5cmB.≤10cm,≤5cmC.≤5cm,≤10cmD.≤10cm,≤10cm
A.1cmB.5cmC.10cmD.15cm