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.
Today, bridges are usually made from rosewood or zi-tan. Other parts of the guzheng are less sensitive to wood selection, but mostly for appearance reasons, zi-tan, rosewood, sandalwood and other rare tropical woods are used most often. Guzheng is an ancient Chinese musical instrument.