地方人民代表大会制定的有关安全生产的地方性法规，与( )相抵触，属于无效。
A．行政法规
B．部门规章
C．地方政府规章
D．国际公约
参考答案：A
锅炉燃料气系统为保证安全必须控制烧嘴背压，防止（）。
A、脱火
B、回火
C、超温
D、A和B
根据句意及首字母提示填写单词，使句子意思完整。
1. Mr. Wang is very r________. He has quite a lot of money.
2. Kangkang is feeling truly sad. He f________ the English exam.
3. It's my dream to l________ on the moon one day.
4. Shanghai is in the e________ of China. It's a beautiful city.
5. I'm a s________ here. Can you tell me the way to the railway station?
