Which two statements are true about the command ip route 172.16.3.0 255.255.255.0 192.168.2.4?（） [" It establishes a static route to the 172.16.3.0 network."," It establishes a static route to the 192.168.2.0 network."," It configures the router to send any traffic for an unknown destination to the 172.16.3.0 network."," It configures the router to send any traffic for an unknown destination out the interface with the address 192.168.2.4."," It uses the default administrative distance."," It is a route that would be used last if other routes to the same destination exist."]
通过引种和驯化可以直接将其他国家或地区优良的品种引进加以利用。
环境质量标准
逻辑法
一个品系的性状必须独特，但不一定符合生产需求。
有效孔隙度
