题目1单选题
<img src="https://tihai-oss-cloud.itihey.com/img/6c5275a64a50bbe39aa4a46ae1806e79.png">A. k<img src="https://tihai-oss-cloud.itihey.com/img/3fa69b5ed2e15416e4e45b125cfc90d9.webp">-2 或 k<img src="https://tihai-oss-cloud.itihey.com/img/3fa69b5ed2e15416e4e45b125cfc90d9.webp">3B. k<img src="https://tihai-oss-cloud.itihey.com/img/47e3df6fddf8fe710a1ed58d14a47348.webp">-2 且 k<img src="https://tihai-oss-cloud.itihey.com/img/47e3df6fddf8fe710a1ed58d14a47348.webp">3C. 不存在仅有零解的情况D. k=-2 或 k=3