题目1单选题
由方程 <img src="https://tihai-oss-cloud.itihey.com/img/43089a3aec65fc88c73e96a718281364.png"> <img src="https://tihai-oss-cloud.itihey.com/img/2ba9453f5dcf4aba4d0e2e88ce0a072d.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/c089903d84b83e5138621248ebb4c60d.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/1323e31be281c8b421ccb68df77c3a65.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/1e8aeda18401724981401c427be7b8df.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/ac0255389408ce96bc52b8743cdb9946.png">