[单选题]The invention of ( ) in the 14th century made the water clock and its feedback control system obsolete.moC答案窝(daanwo.com)-大学生作业答案及考资分享平台 A automatic control loopmoC答案窝(daanwo.com)-大学生作业答案及考资分享平台 B the mechanical clockmoC答案窝(daanwo.com)-大学生作业答案及考资分享平台 C boilermoC答案窝(daanwo.com)-大学生作业答案及考资分享平台 D the steam enginemoC答案窝(daanwo.com)-大学生作业答案及考资分享平台