The boy was not lift the box of apples.
A:enough strong
B:enough strong to
C:strong enough to
D:strong enough
化简11×2+12×3+13×4+⋯+19×10得( )
—Yes. She is similar________ her mother.
已知函数y=x2+1x≤0-2xx>0,使函数值为5的x的值是( )
空气中氧气含量测定的再认识.
【实验回顾】如图是实验室用红磷燃烧来粗略测定空气中氧气含量的装置.