实验小组利用如图甲所示的实验装置，探究外力对滑块做功与滑块动能变化的关系．如图所示，用游标卡尺测得遮光条的宽度d=1.56cm；实验时将滑块从图甲所示位置由静止释放，由数字计时器读出遮光条通过光电门的时间△t=0.4×10^﹣2s，则滑块经过光电门时的瞬时速度为____ m/s（保留3位有效数字）．

在本次实验中还需要测量的物理量有：钩码的质量m、滑块与遮光条的质量M、光电门与滑块在运动起点时遮光条之间的距离L．外力对滑块做功W的表达式为____，滑块（和遮光条）动能变化量E_k2﹣E_k1的表达式为____．通过几次实验，若两者在误差允许的范围内相等，从而说明合外力对滑块做功等于滑块动能变化量．

    Most of us have probably1of Mickey Mouse, Donald Duck, and many other famous Disney characters. Perhaps we have even seen them in movies. But have you ever2to Disneyland? 3fact, there are now four4Disneyland amusement parks around the world. Two are in the United States, one is in Japan, and5 is in France.
    Disneyland is an amusement park, but we can 6call it a theme park. It has all the normal7that you can find at an amusement park, but it also has a theme. The theme, of course, is Disney movies and Disney characters. For example, you can find a roller coaster in most amusement parks, but in Disneyland, the8of the roller coaster is Disney characters. This means that you can find Disney characters all over the roller coaster. You can also 9Disney movies, eat in Disney restaurants, and buy Disney gifts. And you can see Disney characters 10around Disneyland all the time.

下列关于下图所示实验的说法，正确的是

已知$\frac{x}{3}=\frac{y}{2}$，那么下列式子中一定成立的是（    ）

下列对《如梦令》这首词的理解不正确的一项是（   )。