结核病的

Is the respiratory system with phthisical common disease common what is the symptom?

病常见呼吸系统常见症状是什么？

2-cyanopyrazine is an important raw material in manufacturing pyrazinamide, anlitubercu-lar drug.

氰基吡嗪是生产治疗病药物吡嗪酰胺重要原料。