推理猜测题:
(1)三棱锥有﹙ ﹚条棱,四棱锥有﹙ ﹚条棱,十棱锥有﹙ ﹚条棱;
(2)﹙ ﹚棱锥有30条棱;
(3)﹙ ﹚棱柱有60条棱
(1)6,8,20;
(2)十五;
(3)二十.
— Do you have a PE lesson today?
— No, we don't. We have _____ art lesson today. [ ]
A. a
B. an
C. the
D. /
责任原理包含()。
A.明确个人职责
B.产权明晰
C.职位设计和权限委授要合理
D.奖惩分明、公正、及时