A:are; running
B:is; runing
C:are; run
D:is; running
已知∠A为锐角,求满足下列条件的∠A的度数(精确到1″).
(1)sinA=0.9816;
(2)cosA=0.8607;
(3)tanA=0.1890;
(4)tanA=56.78.
卵细胞形成过程中,卵原细胞、初级卵母细胞、次级卵母细胞、卵细胞的个数比是( )