—In which part of the play was _____ you
题型：选择题
问题：
— In which part of the play was _____ your brother appeared?
— In the last ten minutes. [ ]
A. that where
B. this when
C. it that
D. it where
题型：选择题
— In which part of the play was _____ your brother appeared?
— In the last ten minutes. [ ]
A. that where
B. this when
C. it that
D. it where
，质量为m的滑块距挡板P为s，以初速度v沿斜面上滑，滑块与斜面间的动摩擦因数为ц，滑块所受摩擦力小于滑块重力沿斜面的分力，若滑块每次与挡板相碰均无机械能损失，求滑块经过的
路程有多大？