单项选择题
Which of the following server roles provides a common time to all computers？（）
A.NTP B.SNMP C.SMTP D.RAS
单项选择题 WhichofthefollowingBESTdescribesavirtualizedserverenvironment？（）
单项选择题 WhichofthefollowingistheminimumnumberofdrivesrequiredforaRAID10array？（）
单项选择题 Whichofthefollowingisasoftwarelayerthatinteractsbetweenthevirtualizedoperatingsystemand thephysicalhardware？（）
