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搜题
【单选题】
通过(1)关系运算，可以从表3-9和表3-10获得表3-11：表3-11的主键为(2)。A.
投影
B.
选择
C.
笛卡儿积
D.
自然连接
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】企业编制财务报表应当遵守以下基本要求()
A.
遵守各项会计准则
B.
一般应该遵守权责发生制的要求
C.
报表项目要符合一致性
D.
报表应该有单位、时间、计量金额等信息
【判断题】The alternating-bit protocol is the same as the GBN protocol with a sender and receiver window size of 1.
A.
正确
B.
错误
【单选题】Identify the topic sentence: (1)Warmed up a bit, I took a walk along the main aisle. (2)I loved to look at each company's display. (3)Always showing their biggest and best produce, they showed my eyes...
A.
Sentence (1)
B.
Sentence (2)
C.
Sentence (3)
D.
Sentence (4)&(5)
E.
Sentence (6)
F.
Sentence (7)
G.
Sentence (8)
【简答题】(Short-answer Question)Consider a register that can store eight bits. Assume that it has been reset so that it contains zeros in all positions. If you transfer four alternating bits (0101) serially in...
【判断题】The alternating-bit protocol is the same as the SR protocol with a sender and receiver window size of 1.
A.
正确
B.
错误
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