求过两点P1(a,b),P2(c,d)的直线的斜率,画出算法的程序框图,并写出相应的程序语句。
解:程序框图如图所示:
程序如下所示:
。
心尖搏动减弱的原因下列哪项错误
A.左室增大
B.心包积液
C.肺气肿
D.左侧大量胸腔积液
E.左侧气胸
On his way back home, he an interesting story on the bus.
A.picked out
B.picked off
C.picked up
D.picked on