故障在多长时间内仍未解决，客户服务中心主管应与系统经理启动紧急预案？（）
A.60分钟
B.2个小时
C.3个小时
D.6个小时
参考答案：A
在访问因特网过程中，为了防止Web页面中恶意代码对自己计算机的损害，可以采取以下哪种防范措施______
A．利用SSL访问Web站点
B．将要访问的Web站点按其可信度分配到浏览器的不同安全区域
C．在浏览器中安装数字证书
D．要求Web站点安装数字证书
— Tom hasn't turned up yet. He might have got lost.
— No, he ________. His car has got a GPS.[ ]
A. must not have got lost
B. wouldn't have got lost
C. can't have got lost
D. shouldn't have got lost
ave got lost