[填空题] 欧洲艺术起源于（），造型艺术出现于（）。

For the following ports， which port is on every bridge in a Spanning Tree Protocol IEEE 802.1w network except the root bridge？（） ["root port","backup port","designated port","alternate port"] What are the default values for GRE tunnel keeplive time and number of retries？（） ["5 seconds and 3 retries","10 seconds and 5 retries","10 seconds and 3 retries","20 seconds and 5 retries","5 seconds and 5 retrie"] 悬挂装置是连接车架与（）之间的弹性连接传力部件。 ["车桥","驱动桥","转向桥","工作装臵"] DWDM设备随着传输距离的增加，总色散随之增加，因此，波分复用系统的无电中继段不能无限制延长。可通过（）措施延长复用段的无电中继距离。 ["色散补偿","功率补偿","性噪比补偿","减少线路损耗"] Refer to the exhibit.Which statement describes DLCI 17?（） ["DLCI 17 describes the ISDN circuit between R2 and R3.","DLCI 17 describes a PVC on R2.It cannot be used on R3 or R1.","DLCI 17 is the Layer 2 address used by R2 to describe a PVC to R3.","DLCI 17 describes the dial-up circuit from R2 and R3 to the service provider."] 欧洲艺术起源于（），造型艺术出现于（）。