下面属于4路CPU的有()
A.E5-2400
B.E5-2600
C.E5-4600
D.E7-2800
参考答案:C
已知椭圆x2+2y2-4=0,则以M(1,1)为中点的弦所在的直线方程是( )
A.x+2y-3=0
B.2x+y-3=0
C.x-2y+3=0
D.2x-y+3=0
体液正常pH值为()
A.0.70~1.10mmol/L
B.0.96~1.62mmol/L
C.290~310mmol/L
D.7.35~7.45
E.2.25—2.75mmol/L