对乙酰氨基酚为() A.第一阶梯轻度疼痛用药 B.第二阶梯中度疼痛用药 C.第三阶梯

题型:单项选择题

问题:

对乙酰氨基酚为()

A.第一阶梯轻度疼痛用药

B.第二阶梯中度疼痛用药

C.第三阶梯重度疼痛用药

D.1级疼痛用药

E.2级疼痛用药

考点:公卫执业医师公卫执业医师36
题型:单项选择题

阅读理解

     Will the world end in 2012? Many people believe the Mayan Calendar 2012 says so. But there is still a heated argument about it. Some people say it is a big hoax. Some are sure of it.

     What exactly is the Mayan Calendar 2012 and who are the Mayans? The Mayans were a group of people who lived thousands of years ago in what is now Mexico. They knew so much about the world and the universe that they invented the Long Count Calendar. The Mayan Calendar 2012 is actually just part of the calendar. 3. The most interesting thing about this calendar is that it seems to predict a great disaster that will happen in the year 2012. According to it, there will be an end to the existing history and a new one will begin.

     One misunderstanding about the Mayan Calendar 2012 is that it points to an end of the world. While the calendar ends in 2012, it doesn't actually indicate that the world will not exist in the year 2012. In fact, instead of referring to a real disaster(灾难) that will happen, it refers to the birth of a new period, the beginning of another circle of the calendar. 

     4. Whether you believe that the Mayan Calendar 2012 points to a real global disaster or not, it would be best if you keep yourself informed(消息灵通的). There are many resources about the Mayan predictions but the best are the ones that include scientific data with the discussion.    

     You should also prepare yourself for the worst thing that can happen. While there is no need to panic, it would be useful if you can prepare yourself for natural disasters such as storms, floods and earthquakes. We should prepare for disasters that can come in any year and not just in 2012.

A. 根据短文内容回答下列问题

1. Why could Mayans invent Mayan Calendar 2012 thousands of years ago?

    _________________________________________________

2. According to the passage, will the world end in 2012?

    _________________________________________________

B. 将短文中划线部分译成汉语

3. _________________________________________________

4. _________________________________________________

C. 请给短文拟一个适当的英文标题

5. ________________________________________________

题型:单项选择题

小红同学在做“观察平面镜成像”实验时,将一块玻璃板竖直架在一张方格纸的上面,再取两段相同的蜡烛A和B一前一后竖放在方格纸上,点燃玻璃板前的蜡烛A,进行观察,如图所示。在此实验中:

(1)方格纸的作用是便于比较像与物               的关系;

(2)两段相同的蜡烛是为了比较物与像的          关系;

(3)移去后面的蜡烛B,并在其所在位置上放一光屏,则光屏上       接收到蜡烛烛焰的像(选填“能”或“不能”),这说明平面镜成的是         像。

(4)用玻璃板代替平面镜,主要是利用玻璃板透明的特点,便于            

(5)如果有3mm厚和2mm厚的两块玻璃板,应选择    mm厚的玻璃板做实验。

(6)实验中我们拿一根相同的蜡烛与另一根蜡烛的像完全重合来研究像,采用的科学方法是

题型:单项选择题

小儿腹泻轻度脱水,脱水量占体重的百分比为()

A.1%

B.7%

C.5%

D.10%

E.12%

题型:单项选择题

在E-mail邮件服务器系统中,用户可用______ 协议访问并读取邮件服务器上的邮件信息。

A.POP3

B.SMTP

C.IMAP

D.IMAP4

题型:单项选择题

2FSK的相位不连续是因为()。

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