—Where's my clock?
—______on the bed.[ ]
A. It
B. It's
C. He's
D. They
答案:B
在直角坐标系中,作出以A(1,2),B(3,5),C(4,1)为顶点的△ABC,并以原点为位似中心,作与它位似的△A′B′C′,使△ABC与△A′B′C′的对应边的比为1:2.
简述高原脑水肿的临床表现及治疗。