下列描述的微生物特征中,所有微生物共同特征的是:
A. 个体微小
B. 分布广泛
C. 种类繁多
D. 可无致病性
E. 结构简单
Erythrocytes transport oxygen that is bound to
A. erythropoitein
B. complement
C. hemoglobin
D. thrombin
13 different clotting factors must interact before blood ______(clots).
A. completmentes
B. suspends
C. coagulates
D. precipitates
the two types of agranulocytes are
A. lymphocyte and phagocyte
B. lymphocyte and neutrophil
C. monocyte and macrophage
D. monocyte and lymphocyte
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