【单选题】A 6 kg bowling ball slides across a slippery waxed floor with a speed of 5 m/s. As it slides, the ball also rotates at a rate of 4 complete revolutions per second. The moment of inertia of the ball is...
【判断题】双子叶植物根的中柱鞘细胞具有凯氏带结构 。
【多选题】关于双子叶植物根的初生结构中的中柱鞘,下列说法正确的是( )。
E.
由厚壁细胞组成,对中柱(维管柱)具有保护作用
【单选题】What was Taylor's response when the author played the ball game with her?
A.
Taylor played the game obediently all the time.
B.
Taylor hit the ball on the author's nose.
C.
Taylor threw the ball outside the room.
D.
Taylor couldn't catch that gooky ball.