题目4多选题
设对某量进行三次同精度观测,得独立观测值<img src="https://tihai-oss-cloud.itihey.com/img/1b20d763f3bfedfb8a30406687c90c66.png">、<img src="https://tihai-oss-cloud.itihey.com/img/d7764dd2644c7628da064a92e91f1e94.png">、<img src="https://tihai-oss-cloud.itihey.com/img/dfe05cd5413d9626e0483649780c0e05.png">,由此求得平差值和改正数向量为:<img src="https://tihai-oss-cloud.itihey.com/img/4a6720eb22c9e493e270b8c37d85ee3c.png">,<img src="https://tihai-oss-cloud.itihey.com/img/c25a0a2b901e83dbcd08db128dee8320.png">,<img src="https://tihai-oss-cloud.itihey.com/img/4933a3465c2f403b179ed740754b3393.png">,则( )A. <img src="https://tihai-oss-cloud.itihey.com/img/8c42fca154648c300b189db5314a60ea.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/bd78ff01c1bb7aeb268cdc40ddf534ad.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/fa201d34856cb91783f94dc9b7ec8627.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/604bf7def190c0c00545625013ca5a80.png">