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【判断题】
发动机对外输出动力不足主要原因是点火时间过退。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】In all forms of chromatography there is a mobile phase and a stationary phase. a) In thin layer chromatography what is the stationary phase? b) In thin layer chromatography what is the mobile phase?
【简答题】表达式 Not 13 Mod 3 = 1 Or 5 Mod 2 4的值是__________。
【单选题】In which type of chromatography, the stationary phase held in a narrow tube and the mobile phase is forced through it under pressure?
A.
Column chromatography
B.
Planar chromatography
C.
Liquid chromatography
D.
Gas chromatography
【单选题】当x=8,m=-80时,表达式x/sqr(abs(x^2+m)的值是( ) 其中:sqr()为求平方根函数,abs()为求绝对值函数。例:sqr(9)=3,abs(-5)=5
A.
1
B.
4
C.
8
D.
2
【单选题】In normal phase partition chromatography, the stationary phase commonly used is ( )
A.
chloroform
B.
water
C.
n-butanol
D.
ethyl acetate
【简答题】什么是场外交易市场？其特点是什么？
【单选题】In HPLC, the principle for choosing the stationary phase is ( ).
A.
The difference in boiling point
B.
The difference in temperature
C.
Like dissolves like
D.
The chemical stability
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