court of common pleas 是什麽部門?急

今天收到他們寄的一個卡。卡上麵寫著.. 

recently, you were sent a questionnaire and summons to report for jury service. to date, we have not received a response. in order to avoid future court action you must immediately complete the questionnaire and return it to the jury selection commission. questions concerning this notice should be directed to 683-7170. your Appearance date is printed on the reverse side of this postcard

if you have already returned questionnaire, please disregard this notice