施工队进行现场施工时应（）。便于甲方管理，及提高移动施工队伍的整体形象。 ["带好工器具","穿着工作制服","穿着工作制服","随身携带名片"]
语言中一个句子的长度是有限制的。
钢筋混凝土管道采用水泥砂浆抹带接口，抹第一层砂浆时，注意管带与管缝对中，厚度为带厚的（），压实与管壁粘牢，表面要“划毛”，管径400mm以内者，管带可一次抹成。 ["1\/3","2\/3","1\/2","3\/4"]
You are creating a Windows Forms application by using the .Net Framework 3.5.You create an instance of a Backgroundworker component named backgroundWorker1 to process operations that take a long time.You discover that when the application attempts to report the progress，you receive a System.InvalidOperationException exception when executing the backgroundWorker1.ReportProgress method.You need to configure the BackgroundWorker component appropriately to prevent the application from generating exceptions.What should yo do？（） ["Set the Result property of the DoWorkEventArgs instance to True before you attempt to report the progress.","Set the CancellationPending property of backgroundWorker1 to True before you attempt to report the background process","Set the WorkerReportsProgress property of backgroundWorker1 to True before you attempt to report the background process.","Report the progress of the background process in the backgroundWorker1_ProgressChanged event."]
带式输送机的原动力是（）。 ["输送带","托辊","电动机","控制箱"]
丙烷制冷压缩机油分离器原理是什么？
