慢性粒细胞白血病不易早期发现的原因是
A.发病早期骨髓象完全正常
B.检查方法灵敏度低
C.具有一定的潜伏期
D.病人早期无自觉症状
E.发病早期血象完全正常
参考答案:D
China is always carrying out foreign policies that are ______ enough to fit in with varieties of complicated
international situations. [ ]
A. particular
B. flexible
C. delicate
D. permanent
SDH网络的同步分配采用什么拓扑结构?