The students should compare a standard 1 kilogram mass with other objects first by holding and then by using a balance scale .
(The students; should compare; a standard 1 kilogram mass; with other objects first) Context(The students should compare,List([0, 27))):(The students; should compare a standard 1 kilogram mass by holding; )
The students should compare,List([0, 27))
The students The students
should compare should compare a standard 1 kilogram mass by holding
a standard 1 kilogram mass with other objects first