题目2A. P=<img src="https://tihai-oss-cloud.itihey.com/img/f91bac7dea8198b12d8ef446b061168c.webp">B. P=<img src="https://tihai-oss-cloud.itihey.com/img/01e4f2b1dfcf078d63dafc2998c7691b.webp">RC. P=U<img src="https://tihai-oss-cloud.itihey.com/img/d95b41b0132546d36f772e78e1837d0c.webp">D. P= <img src="https://tihai-oss-cloud.itihey.com/img/e17a6d76bacf6cb2ff669e6f072f5d25.webp">