第39题: [单项选择]The little boy demonstrated a remarkable ______ ability; his calculation with figures was faster and more accurate than any one of us here. A. numeral B. numerical C. numerous D. numerable 参考答案:B
第40题: [单项选择]8255A的方式选择控制字为80H,其含义是() A. A、B、C口全为输入 B. A口为输出,其他为输入 C. A、B为方式0 D. A、B、C口均为方式0,输出 参考答案:D