Which of the following blood cells differentiate outside of the bone marrow?
A. Neutrophils
Basophils
C. Eosinophils
D. T lymphocytes
E. Megakaryocytes
查看答案
Which cell type has cytoplasmic granules that contain heparin and histamine?
A. Eosinophils
Basophils
C. Lymphocytes
D. Monocytes
E. Neutrophils
What is the approximate life span of a circulating erythrocyte?
A. 8 days
B. 20 days
C. 5 weeks
D. 4 months
E. 1 year
在以横轴表示生产要素X,纵轴表示生产要素Y的坐标系中,等成本曲线的斜率等于2,这表明( )。
A. Px/Py=2
B. Qx/Qy=2
C. Py/Px=2
D. 上述都不正确
在维持产量水平不变的情况下,如果增加2个单位的劳动就可以减少四个单位的资本,则有( )
A. MRTSLK = 2, MPK/MPL = 2
B. MRTSLK = 1/2, MPK/MPL = 2
C. MRTSLK = 2, MPK/MPL = 1/2
D. MRTSLK = 1/2, MPK/MPL = 1/2
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