reactor-grade graphite

例句：

1. 1. The reactor used in this experiment is graded graphite, which has excellent thermal conductivity.
   实验中使用的反应堆是经过分级的石墨，具有极佳的导热性能。
2. 2. The graphite reactor grade is widely used in the nuclear industry for its high strength and low density.
   石墨反应堆级在核工业中广泛应用，因其高强度和低密度而受到青睐。
3. 3. The reactor graphite grade is a key component of the reactor design, with its properties determining the overall performance of the system.
   反应堆石墨级是反应堆设计的关键组成部分，其特性决定了整个系统的性能。