第8题:[单选题]When we say the two objects have relative motion,we mean___. A.the distance between them remains the same B.the distance between them is changing C.the positions of either of them to the earth remain the same D.their positions to the earth remain the same. 参考答案:B
第17题: [单项选择]一汉字的机内码是BOA1H,那么它的国标码是 A. 3121H B. 3021H C. 2131H D. 2130H 参考答案:B 答案解析:解析:国标码是汉字的代码,由两个字节组成,每个字节的最高位为0,机内码是汉字在计算机内的编码形式,也由两个字节组成,每个字节的最高位为1,机内码与国标码的关系是:国标码+8080H=机内码。