若正常成年男子的血铅含量X取对数后的数值呈正态分布。欲描述血铅的平均水平,最适宜采用

题型:单项选择题

问题:

若正常成年男子的血铅含量X取对数后的数值呈正态分布。欲描述血铅的平均水平,最适宜采用的指标是

A.算术均数
B.几何均数
C.中位数
D.百分位数
E.众数

考点:公卫执业医师公卫执业医师
题型:单项选择题

关于反流和误吸,下列不正确的是()

A.吸入物pH越低,临床表现越重

B.吸入物的量越大,临床表现越重

C.误吸入大量胃内容物,死亡率可达70%

D.全麻时反流,误吸以产妇和小儿发生率高

E.急症饱胃患者禁用全麻

题型:单项选择题

It was a chance of a lifetime to win the first               小题1:   

prize on the Story Writing Show. All I had to do                小题2:   

was to write a story or present it. My teachers                 小题3:   

have been telling me how great my writing was.                  小题4:   

So if they had said was true, I would have a chance              小题5:   

of winning the prize. What were better, I had useful            小题6:   

help. There was Uncle Chen, gentleman living                    小题7:    

near my house, who was a very much famous writer.               小题8:   

He agreed to reading my story and give me some                  小题9:   

advices on how to write like a real writer.                      小题10:   

题型:单项选择题

空气污染指数为201-300,空气质量级别为五级,空气质量状况属于重度污染(紫色)。此时儿童、老年人和心脏病、肺病患者应停留在室内,停止户外运动,一般人群减少户外运动。这种说正确吗?()

A.正确

B.错误

题型:单项选择题

所谓露点是指某一温度,在该温度下空气中的水分将会()出来。

A.蒸发

B.冷凝

C.气化

D.结晶

题型:单项选择题

通信网络类别可按不同方式划分,按通信传送方式划分,包含有()。

A.无线通信网

B.电话网

C.邮政实物网

D.电视网

E.移动数字网

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