Your CD4 count. These cells are a type of white blood cell that is destroyed by HIV. A healthy person's count varies from 500 - over 1,000. If you have fewer than 200 CD4 cells, then your HIV has progressed to AIDS.
Aircraft fluid lines are usually made of metal tubing. or flexible hose. Metal tubing (also called rigid fluid. lines) is used in stationary applications and where long, relatively straight runs are possible. They are widely. used in aircraft for fuel, oil, coolant, oxygen, instru-. ment, and hydraulic lines. Flexible hose is generally. used with moving parts or where the hose is subject. to considerable vibration. Occasionally, it may be necessary to repair or replace. damaged aircraft fluid lines.
Scrub planes. Scrub planes are used for the fast removal of stock (reducing the size of boards, or pieces of wood). They are relatively short and narrow and usually have thick blades to avoid flexing under pressure. Some woodworkers consider the scrub plane to be a kind of bench plane (see below). However, its design differs from bench planes in several ways and the deep, gouging cuts that it makes give it a reputation as an 'aggressive' tool, as opposed to the more graceful, rhythmic approach associated with bench planes.