A project manager is at the project kick-off meeting．He confidently states the vision and mission for the project．This PM is exhibiting （） leadership style.

A．hierarchical

B．authoritarian

C．charismatic

D．associative

在着陆跑道上，什么样的风能将尾流的危险延至最长时间？（）

A.微弱的顺风

B.微弱的侧风

C.微弱的逆风