pure selenium ingot

例句：

1. 1. The pure selenium ingot is used as a cathode in the production of semiconductors.
   纯硒锭用于半导体生产过程中作为阴极。
2. 2. The purity of the pure selenium ingot is crucial for its application in electronic devices.
   纯硒锭的纯度对其在电子设备中的应用至关重要。
3. 3. The pure selenium ingot was extracted from the earth's crust using a process that involves high-pressureand temperature.
   纯硒锭通过一种涉及高压和高温的过程从地球表面提取出来。