Primary, secondary and tertiary sectors. There are three main types of industry in which firms operate. These sectors form a chain of production which provides customers with finished goods or services. Primary production: this involves acquiring raw materials.For example, metals and coal have to be mined, oil drilled from the ground, rubber tapped from trees, foodstuffs farmed and fish trawled.ertiary production: this refers to the commercial services that support the production and distribution process, eg insurance, transport, advertising, warehousing and other services such as teaching and health care. Your web browser does not have JavaScript switched on at the moment.
A millimeter is smaller than a centimeter. A millimeter is  one-thousandth of a meter and a centimeter is one-hundreth of a  meter.  10 mm = 1 cm.  1 cm = 10mm . 14 people found this useful. Edit.
Centimeter is a metric system length unit and equals to one hundredth of a meter. The abbreviation is cm. Millimeter is a metric length unit and equal to one thousandth of a meter. Used widely to measure small distances in engineering and machining.