A、pH=2滴定Al³⁺，pH=4滴定Fe³⁺
B、pH=1滴定Fe³⁺，pH=4滴定Al³⁺
C、pH=2滴定Fe³⁺，pH=4返滴定Al³⁺
D、pH=2滴定Fe³⁺，pH=4間接法測(cè)Al³⁺

A、lgKNY-lgKMY≥2和lgcK′MY和lgcK′NY≥6
B、lgKNY-lgKMY≥5和lgcK′MY和lgcK′NY≥3
C、lgKNY-lgKMY≥5和lgcK′MY和lgcK′NY≥6
D、lgKNY-lgKMY≥8和lgcK′MY和lgcK′NY≥4