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【简答题】
要求89C51五个中断源按下列优先顺序排列,判是否有可能实现?若能,应如何设置中断源的中断优先级别?若不能,试述理由。 1T0 、T1、INT0、INT1、串行口 2 串行口、INT0、T0、INT1、T1 3INT0 、T1、INT1、T0、串行口 4INT0 、INT1、串行口、T0、T1 5 串行口、T0、INT0、INT1、T1 6INT0 、INT1、T0、串行口、T1
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举一反三
【单选题】He tried and tried but all his efforts were ______.
A.
in no way
B.
on the contrary
C.
at a loss
D.
of no avail
【单选题】He insisted that he really very tried and that he to have a rest.
A.
was;be allowed
B.
was;must be allowed
C.
should be;must be allowed
D.
should be;be allowed
【单选题】Carl Sandburg had also taken interest in folk songs which he tried to collect and sing during his travels. These folk songs appeared eventually in print in his well-known______.
A.
Good Morning, America
B.
The People, Yes
C.
In Reckless Ecstasy
D.
The American Songbag
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