Which two classes or interfaces provide a getSession method？（） javax.servlet.http.HttpServletRequest。 javax.servlet.http.HttpSessionContext。 javax.servlet.http.HttpsServletResponse。 javax.servlet.http.HttpSessionBindingEvent。 javax.servlet.http.HttpSessionAttributeEvent。
教师在讲课时要求有必要的走动和手势，以增强学生感知的效果，所依据的感知规律（）。 强度律。 差异律。 活动律。 组合律。
Your computer runs Microsoft Windows Vista Home Basic edition. When you attempt to upgrade your computer to Microsoft Windows Vista Ultimate edition by booting from the DVD-ROM， you receive the following warning message： "The partition you selected might contain files from a previous Microsoft Windows installation. If it does， these files and folders will be moved to a folder named Microsoft Windows.old. You will be able to access the information in Microsoft Windows.old， but you will not be able to use your previous version of Microsoft Windows." You need to complete the upgrade. What should you do？ （） Boot into safe mode. Launch the setup.exe application from the Windows Vista Ultimate edition DVD-ROM.。 Boot from the Windows Vista Ultimate edition DVD-ROM and click the command prompt option. Use the diskpart utility to create a new primary partition for the Windows Vista Ultimate edition installation.。 Log on to the Windows Vista Home Basic edition installation. Launch the setup.exe application from the Windows Vista Ultimate edition DVD-ROM， and then click the Custom （Advanced） option.。 Log on to the Windows Vista Home Basic edition installation. Launch the setup.exe application from the Windows Vista Ultimate edition DVD-ROM， and then click the Upgrade option.。
应急救援预案全面演练时参演人员所承担的具体任务是（）。 确保演练的进度。 模拟受害或受伤人员。 救助伤员或被困人员。
APTT是监测患者的：（） 活化部分凝血活酶时间。 出血时间。 凝血时间。 纤维蛋白原。 D-D聚体。
粗车工件平面的表面粗糙度为（）。
