计算机字长是计算机的主要技术指标之一,它不仅标志着计算机的计算精度,而且也反映计算机 ______ 的能力。
参考答案:处理信息或信息处理
— I called you last night but no one answered the phone.
— I ______ dinner with my friends in the restaurant. [ ]
A. have
B. had
C. was having
D. have had
服务是一种非实物形式的特殊劳动产品,具有一定的使用价值或效用。