当选择“文件>新建”命令，在弹出的“新建”对话框中可设定下列哪些选项？（） ["图像的高度和宽度","图像的分辨率","图像的色彩模式","图像的标尺单位"]
硬聚氯乙烯风管适用于（）。 ["低、中压空调系统","低、中、高压洁净空调系统","中压以下的空调系统","洁净室含酸碱的排风系统"]
You work as a network technician at. Your boss， Mrs. ， is interested in the Spanning Tree Protocol timers. What can you tell her regarding the default STP timers？ （） ["The hello time is 5 seconds.","The forward delay is 10 seconds.","The hello time is 2 seconds.","The forward delay is 15 seconds","The max_age timer is 15 seconds.","The hello time is 10 seconds.","The max_age timer is 20 seconds.","The forward delay is 20 seconds.","The max_age timer is 30 seconds."]
中共党员必须履行的义务有（）。 ["六项","七项","八项","九项"]
热力学第一定律又称为（）。 ["分子运动论","能量守恒和转化定律","牛顿第一定律","热传递定律"]
在WEB网站上设置默认文档有什么用处？
