处理机密级信息的涉密计算机系统的口令字长度不得少于（）个字符。
参考答案：10
由北齐、北周入隋的作家是（ ）
A．卢思道、杨素、薛道衡
B．江总、许善心、虞世基
C．江总、许善心、薛道衡
D．卢思道、杨素、许善心
—Hi, Tina.What did you do _____ your last day off?
—I went to the Old People's Home. [ ]
A. on
B. by
C. in
