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【单选题】
Suppose a browser sends an HTTP request message with the If-modified-since: header. Suppose the object in a server has not changed since the last time a client retrieved the object. Then the server will send a response message with the status code:A.
404 Not Found
B.
304 Not Modified
C.
200 OK
D.
None of the above
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【简答题】()继电器防止信号自动重复开放。
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【单选题】BlueFin canned tuna has higher sales than its unbranded rival, even though the unbranded tuna costs $0.45 less per can than BlueFin tuna. BlueFin most likely has ________.
A.
an aggressive brand personality
B.
high brand equity
C.
no brand commitment
D.
negative brand equity
E.
low brand relevance
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