吸入高浓度氧或吸氧时间过长,可能引起早产儿()
A.视网膜病
B.支气管肺发育不良
C.颅内出血
D.肺动脉高压
E.早产儿应常规吸氧
参考答案:A, B, C
从正方形的铁皮上,截去2cm宽的一条长方形,余下的面积是48cm2,则原来的正方形铁皮的面积是[ ]
A.9cm2
B.68cm2
C.8cm2
D.64cm2
I tried to call you last night, but I couldn’t ______.
A.get through
B.go through
C.tell off
D.turn off