完全内容检测防火墙检查的对象有（） A.IP、TCP包头 B.七层数据 C.链接状态

终端信息采集从采集渠道看，可以采取手工采集和反馈及（）。

A.查看相关资料

B.经验推算

C.上网查询

D.信息系统自动采集

如图所示，在沿水平方向的匀强电场中有一固定点O，用一根长度为L=0.40m的绝缘细线把质量为m=0.10kg、带有正电荷的金属小球挂在O点，小球静止在B点时细线与竖直方向的夹角为θ=37°．现将小球拉至位置A使细线水平伸直由静止释放，求：

（1）电场力

（2）小球运动通过最低点C时的速度大小

（3）小球通过最低点C时细线对小球的拉力大小．

There used to be a term that was used to describe someone who drove their vehicles down the highway while staring at the scenery. These drivers just drove slowly, taking their own sweet time, as if they had nothing to do and no place in particular to go. Thus, the expression, “Sunday driver”, was born. Consequently, a Sunday driver wasn’t necessarily someone who was driving on a Sunday. A person could be a Sunday driver any day of the week. The expression simply meant that the person was an obstacle to other drivers who were in a hurry.

The expression probably came about because there was a time when people would often decide to go for a relaxing drive on Sunday afternoons. A Sunday drive was a common occurrence years ago and especially on a nice warm sunny day. There were no stores open on Sunday because of the “blue laws”, so you needed to be sure and fill up the gas tank and make any other needed purchases before Sunday arrived.

Some of the states had strict blue laws that even prohibited some activities on Sunday. However, there is still a lot to be said for the slow, gentle life that once existed. It was a time when very few people worked on Sunday except for those professions vital to our well-being such as those in the medical profession. It was a day “set apart” that was used to rest, visit with neighbors and friends, or maybe go to grandma’s house for supper. Today there are many who return to work and children who go back to school overly tired on Monday due to a lack of rest. Perhaps there would be less stress related illnesses if we really kept Sunday as a day of rest.

小题1:According to the passage, “Sunday driver” refers to the person who ______.

A．drives his vehicle on Sundays

B．drives for fun and relaxation

C．enjoys a weekend break

D．makes a Sunday purchase小题2:What does the underlined sentence in Paragraph l mean?

A．Sunday drivers affected traffic flow

B．Sunday drivers drove too slowly

C．Sunday drivers increased traffic speed

D．Sunday drivers felt hatred for other drivers小题3:What kind of activity was strictly prohibited on Sunday by the laws?

A．Visiting with neighbors and friends.

B．Going to the hospital to see a doctor.

C．Having a family get-together.

D．Selling goods or services.小题4:According to the author, Sunday rest would help people______.

A．earn a lot more money

B．experience less pressure

C．keep pace with society

D．improve academic performance

在正常人群中测某正态分布的生化指标，多少人测得值在X±2SD

A．50%

B．68%

C．95%

D．99%

E．99.9%

4个月以下的婴儿消化淀粉的能力尚未成熟。因此，在其食品中不应含有较多的淀粉，否则会引起腹泻甚至营养不良。( )