引起新生儿败血症的相关因素中除外()
A.免疫系统功能差
B.皮肤黏膜屏障功能差
C.T细胞对特异抗原反应差
D.补体含量高
E.白细胞杀菌能力差
参考答案:D
My grandfather likes _____ books. He doesn't often _____ TV. [ ]
A. looking at, see
B. watches, see
C. to read, watches
D. reading, watch
在细胞分化过程中,遗传物质的质和量的变化是()
A.质变化、量减少
B.质不变、量增加
C.质、量均不变
D.质、量均增加