白介素-2作用于()
A.早期造血祖细胞
B.红系祖细胞生成
C.促进幼红细胞生成
D.骨髓多能干细胞有丝分裂
E.T淋巴细胞
参考答案:A
How did interracial marriage get approved in Alabama
A.By a Supreme Court ruling.
B.By state legislation.
C.By a vote of the residents.
D.By the social trend that interracial marriages keep increasing.
p1+p2=0.8192。()
(1)某人射击一次,击中目标的概率是0.8,他射击4次,击中目标3次的概率为p1;
(2)某人射击一次,击中目标的概率是0.8,他射击4次,全部击中目标的概率为p2.