以下不是信息安全的基本要素的是。（）
A、技术
B、制度
C、软件
D、人
参考答案：C
农产品经纪人中级职业资格应具备哪些条件？
It is 30 years ______ China performed the Reform and Opening-up policy ______ has had a great effect not just on China, but also on the world.
A．that; since
B．since; 不填
C．when; that
D．since; that
