当NC故障排除后，按（）键消除报警。 ["RESET","GRAPH","PAPAM","MACRO"]
制动控制的参数一般为（）、（）以及（）的三者综合。
You create an isntance of a BackgroundWorker Component named backgroundworker1.You discover that when the application attempts to cancel the background process you get an exception from the following code segment： backgroundworker1.CancelAsync（）； You need to configure the BackgroundWorker component appropriately to prevent to application from exception.What should you do？（） ["Cancel the background process in the backgroundworker1_DoWork event","Set the IsBusy property og backgroundworker1 to True before you attempt to cancel","Set the WorkerSupportsCancellation property of backgroundworker1 to true before the code","Set the DoWorkEventArgs Cancel property to true"]
据史料记载，隋文帝开皇四年，智贾租得常田一亩，交与田租银钱五文，租田人不负担田赋；灌田水渠破而水溢，田主不负责。据此可知（）。 ["均田制已经瓦解","租佃制在全国范围推广","土地私有制开始确立","经济生活中存在契约意识"]
下列（）因素可能导致先天畸形。 ["环境缺碘","职业危害","环境污染","近亲结婚"]
零库存
