结核性胸膜炎与癌性胸膜炎的鉴别要点是()
A.年龄
B.草黄色渗出性胸腔积液
C.血性渗出性胸腔积液
D.有畏寒、发热症状
E.胸腔积液细胞学检查
参考答案:E
从某电视塔塔顶附近的平台处释放一个小球,不计空气阻力和风的作用,小球自由下落.若小球在落地前的最后2s内的位移是80m,(取g=10m/s2)求:
(1)该平台离地面的高度?
(2)该小球落地时的瞬时速度大小?
Stanford University was founded by Leland Stanford in 1884, _______________ his son who had died before.
A.in spite of
B.in case of
C.in memory of
D.in search of