（二）怎样以三项基本参数选择音响胆管 电子管的三项基本参数相互有一定关系，如果单独着重于某一项参数并不能得到预期的效果。从常见电子管参数中可以发现，高μ管其内阻必然较高，其有效增益Ｋ虽与放大系数成正比，但两者往往相差太大。相反，低μ管的内阻虽然较小，但Ｋ与 (B) how to choose the three basic parameters of the three basic parameters of bile duct tube have a certain relationship with each other, if a particular focus on a parameter does not get the desired results. From the common parameters of the tube can be found, the high resistance of the tube must be higher, the effective gain K although proportional to the amplification factor, but the two often differ greatly. In contrast, the internal resistance of the low-μ tube is small, but K and