短波紫外线具有杀菌作用,主要是因为它可使细菌()A、细胞核蛋白变性、凝固 B、细胞膜破

题型:单项选择题 A型题

问题:

短波紫外线具有杀菌作用,主要是因为它可使细菌()

A、细胞核蛋白变性、凝固

B、细胞膜破裂,细菌死亡

C、代谢酶受抑制

D、干扰细菌多种酶系统

E、以上都不是

考点:预防医学与公共卫生学卫生法学卫生法学题库
题型:单项选择题 A型题

任务型阅读。

     Almost everyone likes to travel. People can travel by car, bus, train or airplane. When they go to other

countries, people usually travel by plane.

    People travel for different reasons. But no matter why they travel, people must plan their trips. First

they decide when and where they want to go. Next they make reservations. If they plan to fly, they make

plane reservations. Some people make reservations by themselves using the Internet. Others let a travel

agent make reservations for them. A carefully planned trip is usually a good trip.

1. People travel for different ________.

2. If they want to travel, they must _________.

3. First they must decide ________ to go.

4. If they ________, they make plane reservations

5. Some people make reservations by themselves using ________.

题型:单项选择题 A型题

输油加热炉在什么情况下要紧急停炉?

题型:单项选择题 A型题

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

题型:单项选择题 A型题

EIQ分析法是指将客户、品项、数量放在一起进行交叉分析,其中EQ分析适用于存储区和拣货区规划。

题型:单项选择题 A型题

变压器并联运行时必须严格遵守的条件是()

A.连接组别相同

B.变比相等

C.短路阻抗相对值相等

D.容量相等

更多题库