等边三角形的内切圆半径,外接圆半径和高的比是( )
A:
B:2:3:4
C:
D:1:2:3
关于亚硝酸盐的叙述,正确的是( )
Bob knows how to cut the cost of the project. I'm sure he can do the work with _____ money and ______people.
Before entering the room,I was asked to show the soldier the________ of my suitcase.