下列属于归纳法和演绎法特点的是（）。 A.归纳法是从个别出发以达到一般性 B.演绎法

关于上肢骨折临床愈合标准，哪项是错误的（）。

A.局部无反常活动

B.外固定解除后观察2天骨折处不变形

C.局部无压痛及纵向叩击痛

D.X线片显示骨折线模糊，有连续性骨痂通过骨折线

E.外固定解除后上肢能向前举1kg重量达1分钟

对于少年儿童来说，各种身体素质的最快发展阶段有一定的年龄特点。以下说法错误的是（）

A.平衡能力训练在小学低年级即可进行

B.柔韧性、反应速度等可从小学高年级开始系统训练

C.速度训练的最佳时间是初中阶段

D.专项耐力训练最好到初中阶段

E.重力性训练最好到高中阶段

网络安全管理的技术手段包括（）

A.病毒防治

B.防火墙

C.人员管理

D.信息保密

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.

电视画面的时间特性主要有（）、（）和（）。