诊断新生儿狼疮时,具诊断意义的抗体是()
A.抗RNP抗体
B.抗磷脂抗体
C.抗SSA(RO)抗体
D.抗中性粒细胞胞浆抗体
E.抗组织细胞抗体
参考答案:C
It is such a modem machine ____few of the workers know how to operate it.
A.which
B.that
C.as
D.the one
钢按化学成分和质量可分成几类?