水泥密度试验的水泥填充质量为50g，精确至0.01g。
准静止锋
巴比伦之囚
简述激励应遵循的原则。
You are developing an ASP.NET Web page. You add the following markup to the page. You add the following code segment to the code-behind. You need to save the uploaded file and display a message to the user that indicates that the upload either succeeded or failed. Which two actions should you perform？（） ["Replace line 3 with the following code segment. if （FileUpload1.HasFile）","Replace line 3 with the following code segment. if （FileUpload1.FileContent.Length > 0）","Insert the following code segment at line 6. FileUpload1.SaveAs（saveName）；","Insert the following code segment at line 6. FileUpload1.FileContent.CopyTo（new FileStream（saveName， FileMode.Open）；"]
什么叫弹性？
