搜题请搜索小程序“爱下问搜题”
问题 多项选择题

提高作业能力和降低疲劳要采取的措施有（）

A.改进操作方法，合理应用体力

B.合理安排作业休息制度

C.改善工作内容，克服单调感

D.合理调节作业速率

E.以最大负荷强度工作

答案

参考答案：A, B, C, D

解析：提高作业能力和降低劳动疲劳的措施有：①改进操作方法；②合理安排作业休息制度；③改善工作内容；④合理调节作业速率。

填空题

在科学研究中，分类是常用的方法之一。对于同一种物质，由于分类的依据不同，分类的结果也有所不同。以“水”为例，下列各组物质中，水均与其他三种物质所属类别不同。

（1）依据物质通常存在的状态：H2O、CO2、MgO、CaO中，水属于_______。

（2）依据所含物质种类数目：在水、空气、土壤、海水中，水属于_______。

（3）依据物质所含元素种类：在H2O、H2SO4、Na2CO3、NaOH中，水属于_______。
查看答案
改错题

John’s house became too big for him after his wife died, so he bought a smaller one

nearby. There is a very nice old clock in his first house. When some people came to help

move a clock, John thought, “I won’t let them take off my beautiful old clock in the truck.

Perhaps they are likely breakit.” So she carried it on his arms. One the way, a small boy

looked at John for a few second and said, “How interested you are! Why did you buy so a

large watch?”
查看答案