There _______ a ruler and two pens on the desk. [ ]
A. is
B. are
C. am
D. be
答案:A
This is your pen. __________.[ ]
A. Give you
B. Here you are
C. Here are you
D. You are here
安徽省司法厅印发的《计算机信息系统安全和保密工作管理办法》中,涉密移动存储介质的管理应遵循()原则。
A、统一购臵
B、统一标识
C、统一备案
D、跟踪管理