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【单选题】
试指出下列气体中,哪一个不能用作气相色谱法常用的载气( )A.
氢气
B.
氮气
C.
氧气
D.
氦气
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反馈参考答案：
举一反三
【判断题】2007 年 11 月世界无线电大会上,对有关频谱使用的国际协议进行了修订和更新。会议明确决定,国际移动通信标准 IMT-2000 和 IMT-Advanced 频段不可以通用。
A.
正确
B.
错误
【多选题】Choose the THREE letters A-G. Which THREE of the following problems are mentioned in connection with 20th century housing in the East End?
A.
unsympathetic landlords
B.
unclean water
C.
heating problems
D.
high rents
E.
overcrowding
F.
poor standards of building
G.
houses catching fire
【简答题】（ 14 ）执行以下程序后输出的是 Private Sub Command1_Click() Ch$= ” AABCDEFGH ” Print Mid(Righ(ch$,6),Len(left(ch$,4)),2) End Sub A)CDEFGH B)ABCD C)FG D)AB
【单选题】Which of the following led to the slowdown in American educational advances in the last three decades of the 20th century?
A.
No easy access to financial aid.
B.
veremphasis on preschool programs.
C.
A dramatic fall college enrollment rates.
D.
A rise in the number of poor school districts.
【单选题】执行以下程序后输出的是 Private Sub Command1_Click() Ch$=“AABCDEFGH” Print Mid(Right(ch$,6),Len(left(ch$,4)),2) End Sub
A.
CDEFGH
B.
ABCD
C.
FG
D.
AB
【多选题】Which thoery is know as one of the three indispensable theories upon which the science of biology is built in 19th century?
A.
The theory of evolution
B.
The cell theory
C.
The theory of equilibrium thermodynamics
D.
Mendal's law of inheritance
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