Objective To report a case of acute myeloid leukemia (AML) with CD7 + near-tetraploid clones by doublet(8; 21).
目的报道1例以CD7+和双重t（8；21）易位为特征的近四倍体克隆急性髓细胞性白血病（AML）。
The design of a diffractive reflective hybrid singlet is presented to replace a conventional doublet telescope objective.
提出了一种用以替代双胶合望远物镜的折衍混合单透镜的设计方法。
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