开标时判定为无效的投标文件，应当( )。

A．不再进入评标

B．在初评阶段淘汰

C．在详评阶段淘汰

D．在定标阶段淘汰

A 10-year-old child with appendicitis is being prepared for surgery. Which of the following would be the nurse's first action

A．Administer an enema.

B．Insert a nasogastric tube.

C．Obtain vital signs.

D．Administer antibiotics.