data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA+EAAAAoCAYAAACRtvsHAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAABy5SURBVHhe7Z1PiBzFF8drf6eAoEJQwYiK7q4YA8Z40clBMAfZhIQcNKgguZjZCEpWYg7C5iAJ5hCFXTxo1lxyMiQeloTs4sGAh2yCB40QEpIdRCUG48WIC

如图，△ABC中，DE∥BC，AD=5，BD=10，AE=3，则CE的值为（　　）

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAawAAAAwCAYAAABNG04gAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAAmdSURBVHhe7Z09dqs6EMfHbxVvASZFTlZAVmCncZU2HS7tJl3KdLfBpd2lTeUmsAJ7BT4pgvfC0wgRY1uAxJfhvv/vHG5sDIxGjDTSaOCOYgEBAAAAPecf9

在菱形ABCD中,对角线AC、BD相交于点O,若∠ABC=60°,则AC:BD等于√3：3

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

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

图示结构用力矩分配法计算时分配系数为() A: μBA=0.5,μBC=0.5,μBD=μBE=0 B: μBA=μBC=4/15,μBD=3/15,μBE=0 C: μBA=μBC=4/13,μBD=1,μBE=0 D: μBA=0.5,μBC=0.5,μBD=1,μBE=0

螺纹画法正确的是[img=859x181]17869a9ab2463fb.png[/img] A: BC B: AB C: BD D: AE E: AD

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

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