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【单选题】
下列物质按纯净物、混合物、强电解质、弱电解质和非电解质顺序排列的是A.
纯盐酸、水煤气、硫酸、醋酸、干冰
B.
冰醋酸、玻璃、硫酸钡、氢氟酸、乙醇
C.
单甘油酯、冰水混合物、苛性钠、氢硫酸、三氧化硫
D.
绿矾、漂白粉、次氯酸、氯化钾、氯气
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反馈参考答案：
举一反三
【单选题】Windows 7中,对于“任务栏”的描述不正确的是( )。
A.
Windows 7不允许用户添加程序图标到任务栏
B.
利用“任务栏属性”对话框“任务栏选项”选项卡提供的“总在最前”可以选择是否允许其他窗口覆盖“任务栏”
C.
当“任务栏”是“自动隐藏”的属性时,“任务栏”一般不显示
D.
“任务栏”的大小是可以改变的
【单选题】Since calculators were introduced, they _________ to be useful tools for people weak in math.
A.
proved
B.
will prove
C.
have proved
D.
are proving
【单选题】Structural changes in an economy and changes in consumer tastes are reasons for:
A.
job creation and job destruction.
B.
job searches.
C.
unemployment during recessions.
D.
unemployment during expansions.
【简答题】account for stand outIn the current economy, with unemployment high and competition for jobs fierce, your resume need to __________ for the right reasons.
【单选题】Since calculators were introduced, they _____ to be useful tools for people weak in math.
A.
have proved
B.
proved
C.
will prove
D.
are proving
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