内部控制机制是指公司的内部组织结构及其相互之间的运作制约关系。（）

So it is today. Schedule disaster, functional misfits, and system bugs all arise because the left hand doesn’t know what the right hand is doing. As work （）, the several teams slowly change the functions, sizes, and speeds of their own programs, and they explicitly or implicitly （） their assumptions about the inputs available and the uses to be made of the outputs. For example, the implementer of a program-overlaying function may run into problems and reduce speed relying on statistics that show how （） this function will arise in application programs. Meanwhile, back at the ranch, his neighbor may be designing a major part of the supervisor so that it critically depends upon the speed of this function. This change in speed itself becomes a major specification change, and it needs to be proclaimed abroad and weighed from a system point of view. How, then, shall teams （） with one another In as many ways as possible. Informally. Good telephone service and a clear definition of intergroup dependencies will encourage the hundreds of calls upon which common interpretation of written documents depends. Meetings. Regular project meetings, with one team after another giving technical riefings, are（）. Hundreds of minor misunderstandings get smoked out this way. Workbook. A formal project workbook must be started at the beginning.

Regular project meetings, with one team after another giving technical riefings, are（）. Hundreds of minor misunderstandings get smoked out this way

A．worthless

B．valueless

C．useless

D．invaluable

这个寓言说明了一个什么道理( )

A．谁都觉得自己生活的地方最好

B．人应该听听别人的看法

C．人只有走出自己的生存空间，才能见到更广阔的世界

D．坐在家里比跑来跑去更正确

节点到节点的加密方式中，在中间节点里有__________，由它来完成一个密钥向另一个密钥的变换。

读“某地等高线图”（下图），回答下列问题。

图中M、P、N三处所处的地形部位依次是（）

A.山丘、山谷、洼地

B.山丘、山脊、洼地

C.洼地、山脊、山丘

D.洼地、山谷、山丘