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【单选题】Which of the following statements is correct:
A.
Gram negative bacteria are stained with purple in Gram staining.
B.
Ordinary pilus mediates transfer of genetic material.
C.
There are both DNA and RNA in virus.
D.
Capsules retard phagocytosis.
E.
There are nucleolus, nuclear membranes in Mycoplasmas.
【单选题】which of the following tests is most valuable for the diagnosis of iron deficiency anemia?
A.
Increased total iron blinding capacity(TIBC).
B.
Hemoglobin reduction.
C.
reduction of serum iron.
D.
Bone marrow iron staining negative
【判断题】Negative Staining is well suited for examining very small particulate materials, such as viruses, ribosomes and protein complexes.
A.
正确
B.
错误
【简答题】常作阴道栓的基质，但不适用于鞣酸与蛋白质有配伍禁忌的药物（ ）
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