请根据图(A)所示网络结构回答下列问题。
如果在不改变路由表项的前提下，请写出在路由器RF上最多可再连接的路由器数量。
参考答案：
11
解析：
路由器RF下面连接的网络是192.168.1.248/29，由192.168.1.249、192.168.1.250和192.168.1.251三个网络汇聚得到。此外网络192.168.1.252、192.168.1.253和192.168.1.254的IP地址前29位与上面已有的三个网络相同，可以汇聚为同一网络192.168.1.248/29，所以最多可再连接3个路由器。
Have you had a headache during a test Have you ever been so worried about something that you have a headache or even can’t sleep at night If so, then you know what stress is. Stress is what you feel when you are worried about something. This worry in your mind can make your body feel bad. You may feel angry, sad, scared, or afraid—all of which can give you a stomachache or a headache.
However, there are different kinds of stress. Some kinds of stress are good and others are bad. Good stress might happen when you’re called to answer questions in class or when you have to give a speech. This kind of stress can help you to get things better done. For example, you may do a better job on your test if the stress pushes you to prepare better before the test.
On the other hand, bad stress can happen if stress lasts too long. You may not feel well if your parents are fighting, if a family member is sick, if you’re having problems at school, or if anything else makes you unhappy every day. That kind of stress isn’t going to help you. And it can actually make you sick.
The best way to fight stress is to have a balanced life. Make sure you keep your SELF in mind: Sleep, Exercise, Leisure(休闲), and Food. If you get enough sleep and eat properly, and if you exercise and leave time for fun, you’ll probably feel less stressed.
| Title: Face the Stress | ||
| Meaning of stress | Stress is a (68) when you are worried about something. | |
| Possible effect | You may feel uncomfortable in your (69) and body. | |
| Good stress | · It might happen when you have to (70) in public. · It will be more (71) for you to do the job successfully. · It makes you (72) better before doing the job. | |
| Different kinds | Bad stress | · It might happen if your stress (73) too long. · You may not feel well with the (74) of a family member, problems at school or something else that worries you every day. · It might stop you from getting your work well done. |
| How to keep stress (75) | Have a balanced life. · Have enough sleep and have (76) food. · Take exercise and have time to (77) yourself. | |