题目
A.Iron casting technology has already been employed in Qin (220 to 205 BC) and Han dynasties (206 –220 BC).
B.Iron casting technology has already been employed in Qin (221 to 207 BC) and Han dynasties (236 –210 BC).
C.Iron casting technology has already been employed in Qin (221 to 207 BC) and Han dynasties (202 –220 BC).
D.Iron casting technology has already been employed in Qin (221 to 207 BC) and Han dynasties (201 –227
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