单项选择题

设p：天下大雨，q：我骑自行车上班。命题“除非天下大雨，否则我骑自行车上班。”的符号化形式为

A．p→q
B．┐q→p
C．q→p
D．┐p→┐q
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单项选择题
For relation R where primary key contains multiple, no non-key attribute should be functionally dependent on a part of the primary key. This relation R is at least in
A．1NF
B．2NF
C．3NF
D．BCNF
单项选择题
Local bus can increase the data throughput. The bus that is most frequently used is
A．VESA
B．EISA
C．MCA
D．PCI
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