【简答题】已知质点沿 x 轴作直线运动 , 其运动方程为 式中 x 的 单位为 m, t 的单位为 s .求: (1) 质点在运动开始后 4.0 s 内的位移的大小为 ; (2) t = 4 s 时质点的速度为 , 加速度为
【多选题】下列关于胸椎间盘突出症手术治疗的描述正确的是
A.
后路单纯椎板切除术对于胸椎间盘突出症而言亦是有效的
B.
经非手术治疗3个月症状无缓解或加重者可考虑手术治疗
C.
影像学证实椎间盘突出巨大,脊髓压迫明显,虽然症状轻微,也可考虑手术治疗
D.
侧前方入路椎间盘切除术,是一种相对安全、有效的术式
【单选题】普通班轮运输中,发货人凭经船方签署的场站收据正本联,向船公司或其代理公司换取( )
【单选题】I hate when people have prejudice against female employees and think women are less capable.
【单选题】Women hate public speaking most mainly because of ________.
A.
their upbringing very early on
B.
their inability to appeal to the audience
C.
their sense of greater public pressure
D.
their sense of greater humiliation