He________to put any sugar into the soup. [ ]
A. needn't
B. needs
C. doesn't need
D. need
C
下列符合MDS的是()
A.最终均转变为急性白血病
B.血象均呈全血细胞减少
C.骨髓可见网硬蛋白纤维增多
D.细胞培养有CFU-GM集落少,集簇少
E.无染色体畸变
为什么进户线的绝缘导线的滴水弯下部,要割破一段绝缘层?