执业兽医在执业活动中应履行哪些义务？
如果承包人要求延期开工，应当由（）批准。 ["发包人","工程师","承包人代表","建设行政主管部门"]
Refer to the exhibit. Which statement about dynamic routing protocols for this network is true? （） ["No dynamic interior routing protocol can summarize as shown","Unless configured otherwise, EIGRP would automatically summa rize the prefixes as shown in the exhibit","With this IP addressing scheme, EIGRP can be manually configured to summarize prefixes at the specified summarization points","The IP address design lends itself to OSPF Each summarizing router would be an ABR, summarizing to the next area in the address hierarchy"]
发电机的空载励磁电压、励磁电流分别为多少？
起重电气设备发生火灾时，应立即切断电源，并用（）进行灭火。
大学生注意力不集中的原因有哪些？如何提高注意力？
