NG

NG

1. ■ =Narrow Gauge 窄轨距;

2. ■ Natural Gas 天然气;

3. ■ Neutron-Gamma Reaction 中子伽马反应;

4. ■ New Guinea 新几内亚(澳);

5. ■ Nitroglycerine 硝化甘油;

6. ■ No good 无用;

7. ■ Not Graded 未分级的