HIV weakens a person's immune system so it can't fight the TB germs. In the United States, because of stronger control programs, tuberculosis began to decrease again in 1993, but remains a concern. Many strains of tuberculosis resist the drugs most used to treat the disease. People with active tuberculosis must take several types of medications for many months to eradicate the infection and prevent development of antibiotic resistance.
Quick Answer. The standard width of an upright piano is 5 feet, and the standard depth is between 2 and 2.5 feet. The height varies based on the type of the piano, but vertical pianos above 45 inches fall into the upright category. Continue Reading.
Lyre. view cross section of agrand piano action. (1) Frame-also called the plate or harp, this cast iron frame supports an enormous amount of stress exerted by the strings. The average upright or medium-sized grand piano's strings have a combined pull of about 18 tons (16,300 kg). The tension in a 9 foot concert grand is close to 30 tons!(2) Soundboard-the sound of a string vibrating is pretty feeble on its own.