【单选题】In the gas chromatography, the following action that will NOT affect the resolution of the two adjacent component is to ( ).
A.
choose the detector with higher sensitivity
B.
increase the column length
C.
alter the chemical property of the stationary phase
D.
increase the column temperature
【判断题】如果价格和总收益同方向发生变化,那么需求是越富有弹性( )
【单选题】According to the last paragraph, the author may suggest that______.
A.
either of the two partial theories may be correct
B.
the new theory has been established to replace the two partial theories
C.
the new theory may develop from either of the two partial theories
D.
the new theory may combine many of the properties of the two partial theories
【单选题】下列各句中,加横线字解释错误额一项是()
【判断题】Whe two adjacent part are cut, the hatching direction shall be reverese.
【判断题】The distance between two adjacent node and antinode is . ( )
【多选题】There are two adjacent frames, what of the geometrical elements they may stand for?
B.
A plane and a circular surface
D.
Two intersecting planes