题目1单选题
4.3 如果是单面扩散,那么扩散后硅片的结构示意图正确的是<img src="https://tihai-oss-cloud.itihey.com/img/559e2ba4f4f918a3a4d8a196c6e54455.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/f1be87ab9cc51d3b0711600eb79a1186.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/c005fb42b26493a304ce1bc099b9b996.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/762a30ca8b09db1a5cb4665d48d52874.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/ea68cc7d6e90c072d862aa653dd2b3b5.png">