A.借方期末余额=借方期初余额+借方本期发生额-贷方本期发生额
B.借方期末余额=借方期初余额-借方本期发生额+贷方本期发生额
C.贷方期末余额=贷方期初余额+贷方本期发生额-借方本期发生额
D.贷方期末余额=贷方期初余额+借方本期发生额-贷方本期发生额