下列关于尾气检测说法正确的是 The following statement about exhaust gas detection is correct. A. 尾气检测只检测碳氢化合物 Exhaust gas detection only detects hydrocarbons B. 尾气检测工具一般为尾气分析仪 Exhaust gas detection tools are usually tail gas analyzers. C. 尾气检测没有意义 There is no sense in exhaust gas detection. D. 尾气检测的目的是降低油耗 The purpose of exhaust gas detection is to reduce fuel consumption.