曲线y=2x2在点P(1,2)处的切线方程是 [ ]
A.4x﹣y﹣2=0
B.4x+y﹣2=0
C.4x+y+2=0
D.4x﹣y+2=0
答案:A
---Can __________ work out the problem?
---__________, I think. It is too hard.
A.anyone, No one
B.someone, Nobody
C.anyone, Someone
D.someone, None
心脏骤停首选的治疗措施是
A.心肺复苏B.安置起搏器C.开通静脉输液D.通畅呼吸道E.高浓度吸氧