For most, but not all, HMO plans, youâll need a referral from your primary care physician before you can see any other health care professional (except in an emergency). If your plan requires a referral and you donât get one first, your insurance wonât cover the cost to see the specialist.
The strongest material would be boron fiber. That is not very practical because ot is expensive and brittle. The cost of carbon fiber is probably also too high to use for bridge strands. A drawn alloy steel wire is probably still the best choice, with tensile strengths of over 100,000 pounds per square inch being possible.
reinforce fibers can be made from a number of materials. the most common in industrial application is glass, graphite, boron, aramids using more than one of these materials to form a composite is called a hybrid. The strongest of these reinforcing fibers are aramids, while glass is the weakest.