下列哪项对确诊腹部手术后腹腔内出血意义最大()
A.腹胀逐渐加重
B.病人烦躁不安
C.中心静脉压0.49kPa(5cmHO)
D.尿量<25ml/h
E.诊断性腹腔穿刺
参考答案:E
点P(-3,4)与点(a-1,b+2)关于y轴对称,则a=______,b=______.
A nest is to a bird ______ a house is to a man.
A.as
B.that
C.which
D.what