There will ______ a new library in our school.
A:are
B:have
C:be
D:has
我们都知道“刻舟求剑”的故事,这是因为剑主选错了参照物。要确定落水之剑的位置,应选择的参照物是( )
抛物线y=ax2+bx+3经过点A(1,0)和点B(5,0).
书放在水平桌面,书受到重力作用G,书对桌面有向下的压力F,桌面对书有向上的支持力N.
Only by constant study and changing our ideas can we________ to a changeable environment.