A. No, the lion is big.
B. No, it can't .
C. A duck has wings .
D. No, it lives in a forest .
E. No! A tiger has stripes .
已知代数式x+2y的值是3,则代数式2x+4y+1值是 ( )
内燃机中,将内能转化为机械能的冲程是()
若函数fx=x-bx-a在区间-∞,4上是增函数,则有( )