第n个数就应该是2n-1n2.
In crowded places like airports and railway stations, you ____ take care of your things. [ ]
A. can
B. may
C. must
D. will
颇具开发实力且创新意识强的企业通常为获得领先而勇于承担风险所采用的投资策略是( )。
A.投资侧重于导入期和成长期而放弃成熟期、衰退期
B.投资均衡分布于4个阶段
C.投资侧重于成长期和成熟期,几乎放弃导人期和衰退期
D.投资侧重于导人期产品,兼顾成长期和成熟期