以太网交换机通过建立和维护______进行数据交换。
参考答案:端口/MAC地址映射表
解析: 交换机中通过地址学习维护端口/MAC地址映射表,来进行数据交换。
A.Because she could not sleep well at night.
B.Because she hoped to earn more money.
C.Because she could not find a daytime job.
D.Because she needed a change and a lighter job.
采用对称配筋时,连梁正截面受弯所配置的纵筋最接近于()。
A.A
B.B
C.C
D.D