Meanwhile, the Drazin inverses of PQ and P - Q are established.同时, 给出正交投影的积PQ和差P -Q 的Drazin逆的表达式.In this paper, we investigate the Drazin inverse of a morphism in additive category.本文研究了加法范畴上态射的Drazin逆....
Outside, a raven cawed.外面，一只渡鸦尖叫了一声。Her charming face was framed with raven hair.她迷人的脸上垂落着乌亮的黑发.The symbols of Apollo were the wolf, swan, raven, stag, dolphin, laurel, and lyre.阿波罗的象征物是狼 、 天鹅 、 渡鸦 、 雄鹿 、 海豚 、 桂冠和竖琴....
One of the office girls was down with the flu.一位女职员得了流感。His office was in keeping with his station and experience.他的办公室与其身份和阅历相称。He called me to his office for a man-to-man talk.他把我叫到他的办公室私下谈了谈。...