2) Blltterworth
勃脱华兹
1.
Discussion and Application of Blltterworth Approximate in the Circuit Theory;
勃脱华兹近似在电路理论中的探讨和运用
3) E.O.Waters method
华脱尔斯法
4) Point of Ayr Coal
泼因脱华尔煤
6) removing NO
脱NO
