After a heated discussion at the meeting,a new plan came________being,which would have a great effect________the culture life of people.
A:into;for
B:to;to
C:from;at
D:into;on
复数5i1-2i=( )
下列选项中属于相对性状的一项是( )
冬天医生检查牙齿时,常把小镜子放在酒精灯上适当烤一烤,然后再伸进口腔内,这样做的主要目的是()