痴呆的并发症包括()
A、肺部感染
B、深静脉血栓
C、褥疮
D、心绞痛
参考答案:A, B, C
(1)在等差数列Sn中,d=2,n=15,an=-10,求a1及Sn
(2)在数 * * ,a,bSn8中,前三项成等差,后三项成等比,求a,b.
I tried phoning her office, but I couldn't________[ ]
A.get along
B.get on
C.get to
D.get through