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。
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水边植物应能增加水体的（）美感，不应过分绚丽，应以（）；（）；（）为主。
Which two statements are true about the command ip route 172.16.3.0 255.255.255.0 192.168.2.4?（）
A. It establishes a static route to the 172.16.3.0 network.
B. It establishes a static route to the 192.168.2.0 network.
C. It configures the router to send any traffic for an unknown destination to the 172.16.3.0 network.
D. It configures the router to send any traffic for an unknown destination out the interface with the address 192.168.2.4.
E. It uses the default administrative distance.
F. It is a route that would be used last if other routes to the same destination exist.
中央式通风方式通风线路长、阻力大、漏风大、但管理工作简单、易于全矿反风。
A. 正确
B. 错误
IGK、IGL均由______、______、______三个不连续的基因簇组成，每个基因簇又含有______。
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