彭林编著. ( 2 ) ( 1 ) AT 40 : 4 ABD4FBD , PF 1_2 = ZAFB , AT ZABD = 28 ° , ZADB = 90 ° ... AB'D'E'VAC'D'A ' , PFX BE = AC , B'E ' = A'C ' , PTT 1 BE = B'E ' ...
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