在交换机中，当主用单元发生故障是无备用单元可替换，则主用单元切换至WO-EXFAULTY状态，同时每隔（）检查一次系统是否允许进行恢复操作。

A.5分钟

B.10分钟

C.15分钟

D.30分钟

A child watching television experiences a procession of sights and sounds that flash from the screen just long enough for the eyes and ears to take them in. Unlike the pages of a book, which can be read as slowly or as quickly as the child wishes, television images appear with a relentless velocity that stunts rather than. enhances the child’s powers of imagination.
The view expressed above is based on an assumption. Of the following, which can best serve as that assumption

A．When allowed to choose a form of entertainment, children will prefer reading to watching television.

B．A child’s imagination cannot be properly stimulated unless the child has access both to television and to books.

C．A child’s imagination can develop more fully when the child is able to control the pace of its entertainment.

D．Children should be taught to read as soon as they are able to understand what they see on television.

E．(E) A child’s reaction to different forms of sensory stimuli cannot be predicted, since every child is different.