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.
查看答案
按照规定,船舶在下列哪些情况下将暂停船级()。 Ⅰ.船舶未在CCS入级规范规定的期限内完成船级特别检验,且未经CCS同意展期,除非船舶已申请且正在进行检验或修理; Ⅱ.对影响船级的缺陷未能进行必要的修理; Ⅲ.影响船级的修理、改装未经认可;Ⅳ.船东要求撤销船级
A. Ⅰ~Ⅳ
B. Ⅱ~Ⅳ
C. Ⅰ~Ⅲ
D. Ⅰ、Ⅱ、Ⅳ
以下不可以提起行政赔偿的是()
A. 某局违法吊销营业许可证
B. 公安机关紧急情况征用公民财物,造成财物损坏的
C. 某单位工作人员在执法中殴打相对人造成受伤
D. 某警察见死不救,造成相对人死亡的
以下不是漆树科特点的是().
A. 子房下位
B. 叶互生
C. 有树脂道
D. 坚果或核果
某研究者欲了解某地正常成年男性和女性的红细胞总体平均水平是否有差异,随机抽样测定了该地40名正常成年男性和40名正常成年女性的红细胞数,算得男性红细胞的均数为4.68×109/L,标准差为0.57×109/L;女性红细胞的均数为4.16×109/L,标准差为0.31×109/L。该研究资料类型分别是().
A. 定量资料
B. 分类资料
C. 综合资料
D. 等级资料
E. 无法分类