一个盒子里装有黑白两种颜色的棋子各10颗,从中至少摸出______颗才能保证有3颗颜色相同.
2×2+1=5(颗);
答:至少摸出5颗才能保证有3颗颜色相同.
故答案为:5.
The international agreement, _______ encourage children not to smoke and help people to kick the habit, was signed on 27 February.
A.intending to
B.being intended to
C.intended to
D.to intend to
药动学与许多学科相关,指出下列与药动学关系不密切学科()
A.药效动力学
B.临床药学
C.药剂学
D.数学
E.药物经济学