物质的用途是由性质决定的,干冰可用于人工降雨,也可用于灭火,其中原理是什么?请你

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问题:

物质的用途是由性质决定的,干冰可用于人工降雨,也可用于灭火,其中原理是什么?请你简要分析,并举一例说明物质的用途是由性质决定的。

考点:二氧化碳的制取和收集安全措施和生活经验自然界中的碳循环一氧化碳的毒性
题型:问答题
根据表格内容,判断句子正“T”误“F”。
                                Newfield High School
Name: LouisClass: 2Date: Dec. 20th, 2007
SubjectGrade (等级) Comment (评价)
MathD Must try harder
P.E.C- Need to do better
ScienceDo poorly in tests
ArtA+ Clever
EnglishB- Get better
French B- Good work
History C+Show interest
       Rank (排名) in class: 24 of 32
       To parents: Louis is quiet and shy. He is often late for school. He is good at the subjects he likes,
but he should work harder on other subjects.
( )1. Louis does best in art and does worst in P.E.                              
( )2. Louis got a better grade in English this year than before.                 
( )3. Louis is a quiet and shy boy. He often gets home late.                     
( )4. The teacher thinks Louis should work harder on the subjects he doesn't like.
( )5. There are 32 students in Louis' class. He got the 24th place (名次).       
题型:问答题

Lily is a good girl. She _____ helps others. [ ]

A. never

B. always

C. sometimes

D. usually

题型:问答题

关于排尿反射训练正确的是()

A.叩击频率50~100次/分,叩击次数100~500次

B.叩击频率10~50次/分,叩击次数100~500次

C.叩击频率100~150次/分,叩击次数100~500次

D.叩击频率50~100次/分,叩击次数100~200次

E.叩击频率100~150次/分,叩击次数100~200次

题型:问答题

职业病危害预评价的技术服务资质认证需要通过()。

A.市级以上人民政府卫生部门

B.省级以上人民政府卫生部门

C.市级以上卫生监督机构

D.省级以上卫生监督机构

E.国务院卫生行政部门

题型:问答题

下列不属于激励的作用的是:( )。

A.有利于激发和调动职工的积极性

B.有助于将职工的个人目标与组织目标统一起来

C.有利于领导对员工的控制

D.有助于增强组织的凝聚力,促进内部各组成部分的协调统一

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