how to judge this? Please refer to the best answer of this link:/question/1157572.html.

It should be noted that the five sharp signs are not necessarily in B major, let alone in B natural major. Five sharp signs can only be determined to be B, B is a key, and B natural major is a mode in B key. Harmonic modes are different, so don't confuse them. B harmonic major, G sharp natural minor, G sharp harmonic minor, B palace mode, C sharp quotient mode and so on all belong to the category of B key. So I can only know that it is B, and I can't judge it more specifically.

if there is anything you don't understand, please ask. :)

Music and Composition Technology (Team) -Sphalerite