A.12B.4C.8D.16
A.wait 语句B.process 语句C.块语句D.生成语句
A.std_logic_arith、std_logic_unsigned、std_logic_signedB.std_logic_arith、std_logic_unsigned、std_logic_1164C.std_logic_unsigned、std_logic_1164、std_logic_arithD.std_logic_1164、std_logic_arith、std_logic_unsigned、std_logic_signed
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