美国医学物理学家学会(AAPM)规定加速器中心轴上PDD和TAR的稳定性每年监测的允许精度为()
A.±1%
B.±2%
C.±3%
D.±4%
E.±5%
参考答案:B
--- These dumplings are delicious.
---Yes. But I think the ones with beef are ___________ of all.
A.delicious
B.more delicious
C.the most delicious
D.the delicious
巨幼细胞贫血属于:()
A.小细胞低色素贫血
B.正细胞性贫血
C.大细胞性贫血
D.小细胞正色素贫血
E.以上都不是