单项选择题 用来指定命令对象的连接属性是（）

单项选择题 While installing a new PCI card the administrator touched the motherboard. While powering on the server, a series of beeps were emitted and the server did not POST. Which of the following could be done to prevent this problem?（）

单项选择题 Whichofthefollowingarchivingmethodsonlybacksupdatathathaschangedsincethepreviousfull backup？（）