题目： 质量信息系统的战略层的特点之一是______。A．数据外部化B．汇总性C．历史性D．可比性 答案： 参考答案：A解析：战略层的信息系统通常有以下特点：随机性、异常信息、预测性、概要性、数据外部化、形式非结构化及主观性。
题型：选择题 Schools across China are expected to hire 50,000 college graduates this year as short-term teachers, almost three times the number hired last year, _____reduce unemployment pressures. A．helpB．to have helpedC．to helpD．having helped 查看答案
