在城轨运输企业安全生产过程中所用到的法律法规中，《中华人民共和国安全生产法》属于（）。
A、专门法
B、基础法
C、相关法
D、单行法
参考答案：A
用所给单词的适当形式填空。
1. I won't leave until it ____ (not) rain.
2. He often hears the boy____ (play) the guitar,
3. If you drink some tea before going to bed, you will be possibly____(wake) and can't
easily get to sleep again.
4. I felt ____(tire) after a long time of study.
5. It's important ____(keep) healthy.
剖视图的特点是能清楚地表达机件的外形。
