I have never heard "a pair of ruler" but I wouldn't be surprised if someone on this planet said it that way.SingularI have a ruler.Here, borrow my ruler.Thank-you for lending me your...
a metric ruler is a measuring instrument where the units of measures are not inches, but centimeters. 10 millimetres = 1 centimetre 1 inch = 2.54 centimetre In the world, only three countries haved...