He for nearly 20 years.
A:When; has left
B:When; has been away
C:How long; has left
D:How long; has been away
150÷3=5
某农机厂四月份生产零件50万个,第二季度共生产零件182万个.设该厂五、六月份平均每月的增长率为x,那么x满足的方程是( )
如图,已知AB∥CD,E是AB上一点,DE平分∠BEC交CD于D,∠C=80°,则∠D的度数是( )
big