background:url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层() A: 2、png B: 1、jpg C: 3、png D: 4、jpg

用某种方法排序，调整序列如下，所选排序方法为（ ）。7 4 2 8 1 0 6 30 4 2 8 1 7 6 30 1 2 8 4 7 6 30 1 2 8 4 7 6 30 1 2 3 4 7 6 80 1 2 3 4 7 6 80 1 2 3 4 6 7 80 1 2 3 4 6 7 8

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA+EAAAAoCAYAAACRtvsHAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAABy5SURBVHhe7Z1PiBzFF8drf6eAoEJQwYiK7q4YA8Z40clBMAfZhIQcNKgguZjZCEpWYg7C5iAJ5hCFXTxo1lxyMiQeloTs4sGAh2yCB40QEpIdRCUG48WIC

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAawAAAAwCAYAAABNG04gAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAmdSURBVHhe7Z09dqs6EMfHbxVvASZFTlZAVmCncZU2HS7tJl3KdLfBpd2lTeUmsAJ7BT4pgvfC0wgRY1uAxJfhvv/vHG5sDIxGjDTSaOCOYgEBAAAAPecf9

image组件不支持（）图片格式。 A: JPG B: PNG C: SVG D: BMP

5.下列文件扩展名中,表示图片文件的有( )个.(1)PNG(2)MID(3)GIF(4) A: V (5)MOV (6)MP4(7)WMF(8)RMVB(9)TGA(10)AU(11)EXE(12)TMP B: 4 C: 3 D: 5 E: 6

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAjUAAAA8CAYAAACehUt5AAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAABroSURBVHhe7Z1ZiB1FF4Br/pcYxY2IQSMqmkTUiBu4jKC4gCSi+KKoIL7oRCFiRIUoIyIGDagwQUGNvoSAEfVBIs4gqKCQiQrRiBqJE0UlCiMGo+D2NH9/N

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA3QAAADWCAYAAACZrMDDAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAFSYSURBVHhe7b1pjGXVdbe/O+8rRUqEcWN/iByCLKhGmCEgzKQqQDL5m6Yby2pkoJmkoGBVMYnGYMAMVv4IbGgax93EA90ykbEMzWSBUKgytl4suemWGewYG

下颌牙列牙周膜面积的排列顺序中正确的是（） A: 7 6 5 4 3 B: 6 7 5 4 3 C: 6 7 3 5 4 D: 7 6 5 3 4 E: 6 7 5 3 4

png的最优值是（） A: -2 B: -6 C: -45/4 D: -7