A:The guitar.
B:The drums.
C:The piano.
Dolly is a middle school girl. Her parents want to take her to Ice and Snow Festival. How much will they pay for the tickets?
如图,在正三角形ABC中, D,E,F分别为AB,BC,AC的中点,G,H,I分别为DE,FC,EF的中点,将△ABC沿DE,EF,DF折成三棱锥,则异面直线BG与IH所成的角为( )
对于加速度的理解,下列说法正确的是( )