流行性乙型脑炎的病理改变中.下列哪一项是错误的()
A.筛状软化灶
B.淋巴细胞浸润的围管现象
C.蛛网膜下腔见大量中性白细胞
D.神经细胞变性坏死
E.形成胶质结节
参考答案:C
多项式a3-b3+c3+3abc有因式( )
A.a+b+c
B.a-b+c
C.a2+b2+c2-bc+ca-ab
D.bc-ca+ab
It’s time that you_____with the relief work in the flood-stricken area after the awful typhoon.
A.must help
B.can help
C.helped
D.have helped