题目8单选题
采用微差法测被测量x,与之大小相近的标准量为<img src="https://tihai-oss-cloud.itihey.com/img/02369d6114f4cfa2fffa5f9cf6b4e1ab.png">,其相对误差为<img src="https://tihai-oss-cloud.itihey.com/img/b2bd1fb26de51eae3e7994eb24fac33d.png">,用相对误差为<img src="https://tihai-oss-cloud.itihey.com/img/27a0be73100e4c68ebc3f81e1b6a5207.png">的仪表测其差值(x-B),从而完成对x的测量,则x的测量误差<img src="https://tihai-oss-cloud.itihey.com/img/5a784bd2c94b3501e2d2a5817cd9687c.png">为( )A. <img src="https://tihai-oss-cloud.itihey.com/img/b2bd1fb26de51eae3e7994eb24fac33d.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/27a0be73100e4c68ebc3f81e1b6a5207.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/27a0be73100e4c68ebc3f81e1b6a5207.png">+<img src="https://tihai-oss-cloud.itihey.com/img/b2bd1fb26de51eae3e7994eb24fac33d.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/b2bd1fb26de51eae3e7994eb24fac33d.png"><<img src="https://tihai-oss-cloud.itihey.com/img/5a784bd2c94b3501e2d2a5817cd9687c.png"><<img src="https://tihai-oss-cloud.itihey.com/img/27a0be73100e4c68ebc3f81e1b6a5207.png">