用配方法解方程:x2﹣4x+2=0,下列配方正确的是 [ ]
A.(x﹣2)2=2
B.(x+2)2=2
C.(x﹣2)2=﹣2
D.(x﹣2)2=6
答案:A
The book which__________at the end of last year turned out to be a great success in Shanghai.[ ]
A. came about
B. came up
C. came out
D. came around
产后3天,咳嗽发热,两肺呼吸音粗()
A.正常产褥
B.上呼吸道感染
C.产后子宫内膜炎
D.胎盘胎膜部分残留
E.子宫复旧不良