张拉千斤顶应每月校准一次，当千斤顶发生故障修理后以及钢铰线发生连续断丝时也应进行校准。
参考答案：对
-- When will you have your MP4 repaired?
--Pardon?
--I asked you ___________.
A．when will you have your MP4 repaired
B．whether you would have your MP4 repaired
C．when you would have your MP4 repaired
D．that you would have your MP4 repaired
胎盘剥离后正确处理是
A．按压子宫底部，轻拉脐带助胎盘娩出B．牵拉脐带助其娩出C．手取胎盘D．加强宫缩可用缩宫素，麦角新碱E．刮宫术
