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在PCM系统中，一次群采用码型。

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二进制1010转换成十制数是（）。

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有人值班的牵引变电所每班应设置一名（）、一名（）；有人值守的牵引变电所每班应设置一名（）、一名（）。

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男性，30岁。餐后1小时突发上腹部剧痛，很快扩散至全腹，呈持续性腹痛，伴有恶心、呕吐。查体：腹式呼吸消失，全腹压痛、反跳痛、肌紧张明显，肝浊音界消失。腹部X线平片检查：见膈下游离气体。临床诊断胃十二指肠穿孔伴弥漫性急性腹膜炎。目前，应采取的治疗措施是（）

A. 禁食，胃肠减压，做进一步检查
B. 保守治疗，病情无好转或加重，剖腹探查
C. 腹腔诊断性穿刺，抽出浑浊渗出液，剖腹探查
D. 补液，应用抗生素12小时，剖腹探查
E. 急诊剖腹探查

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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 thebackgroundWorker1.ReportProgress method.You need to configure the BackgroundWorker component appropriately to prevent the application from generating exceptions. What should yo do？（）

A. Set the Result property of the DoWorkEventArgs instance to True before you attempt to report the progress.
B. Set the CancellationPending property of backgroundWorker1 to True before you attempt to report the background process
C. Set the WorkerReportsProgress property of backgroundWorker1 to True before you attempt to report the background process.
D. Report the progress of the background process in the backgroundWorker1_ProgressChanged event.

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