说出棘皮动物的分纲及代表动物
参考答案：
①海星纲，海盘车
②蛇尾纲：阳遂足
③海胆纲：马粪海胆
④海参纲：刺参
⑤海百合纲：海百合、海羊齿
Which routing algorithm is described belowIt is a mechanism in which the sending station determines the route the frame will follow andincludes the routing information with the flame；bridges read the routing information to determineif they should forward the frame．
A．Fixed Routing
B．Spanning Tree
C．Source Routing
D．Frame Forwarding
电子商业汇票提示付款期限自票据到期日起（）。
A.1个月
B.2个月
C.6个月
D.10日
