关于核心价格指数，下列说法正确的是（）。 A.是近十几年来我国政府统计部门公布的一种

一般来说，自动控制系统在阶跃扰动作用下，希望得到的过渡过程是( )。

A．(A) 非振荡发散过程

B．(B) 衰减振荡过程

C．(C) 等幅振荡过程

D．(D) 发散振荡过程

命题作文“冬天里的使命”

解救阿托品中毒可用的解毒剂是

A．毒扁豆碱

B．毛果芸香碱

C．姜糖水

D．氯化钾注射液

E．利血生

推荐房源的方法包括( )。

A．对房源情况进行简单介绍

B．介绍房源优缺点

C．提出专业观点

D．广泛推荐，重点收网

E．回避缺点，专注优点

Some species of dolphins find their prey by echolocation; they emit clicking sounds and listen for echoes returning from distant objects in the water. Marine biologists have speculated that those same clicking sounds might have a second function: particularly loud clicks might be used by the dolphins to stun their prey at close range through sensory overload.
Which of the following, if discovered to be true, would cast the most serious doubt on the correctness of the speculation described above

A．Dolphins that use echolocation to locate distant prey also emit frequent clicks at intermediate distances as they close in on their prey.

B．The usefulness of echolocation as a means of locating prey depends on the clicking sounds being of a type that the prey is incapable of perceiving, regardless of volume.

C．If dolphins stun their prey, the effect is bound to be so temporary that stunning from far away, even if possible, would be ineffective.

D．Echolocation appears to give dolphins that use it information about the richness of a source of food as well as about its direction.

E．(E) The more distant a dolphin’s prey, the louder the echolocation clicks must be if they are to reveal the prey’s presence to the hunting dolphin.