题目1单选题
<img src="https://tihai-oss-cloud.itihey.com/img/5f0f9a32ac70ec8aeef400bb1171a1a3.png">的<img src="https://tihai-oss-cloud.itihey.com/img/c67e57e6757f131ea2bc3e66cea3d302.png">溶液的离子强度为( )A. <img src="https://tihai-oss-cloud.itihey.com/img/6f0d9818f138f429e48886788117ef30.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/36b97fb26362413cd96a70cee0a51cd7.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/140f8d42cf3889e758af49b1b7aed0b0.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/840171cfffe25590637bbf0ebb3a840a.png">