【单选题】【消耗次数：1】
1个校验位和1个停止位，若传输速率为1000b/s，则每秒钟传输的最大字符数为（）。
①
10个
②
100个
③
1000个
④
2000个
参考答案：
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相关题目
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若关系R和S分别有r和s个属性，分别含有m和n个元组，则R×S（ ）
①
包含r+s个属性和m+n个元组
②
包含r+s个属性和m×n个元组
③
包含r×s个属性和m+n个元组
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若关系R和S分别有r和s个属性，分别含有m和n个元组，则R×S（ ）
①
A.包含r+s个属性和m+n个元组
②
B.包含r+s个属性和m×n个元组
③
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compare
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spend
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