【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】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