能支持查询传送方式的接口电路中,至少应该有端口和 端口。
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计算机对I/O端口编址时采用哪两种方法?在8086/8088CPU中一般采用哪种编址方式?
This office is very dirty and in a mess; it ____ cleaned.
A. can't have been
B. mustn't have been
C. wouldn't have been
D. shouldn't have been
Jeffery's score on the latest test is the highest in his class; he ____ have studied harder.
A. may
B. should
C. must
D. ought to