absolute bone conduction test的用法和样例：
- The earphones for air conduction and bone conduction testing were TDH-39P and Radioear B-71 models, which accorded with GB/T 4851.1 and GB/T 485 4.3 criteria after adjustment. The impedances of electrode were all less than 5 k ?
- absolute bone conduction
- block bone conduction test
- bone conduction test