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【单选题】
80C51 单片机有( )个中断优先级,每个中断源都可以通过编程确定为高优先级中断或低优先级中断,因此,可实现( )级嵌套。A.
一，一
B.
两，二
C.
一，三
D.
两，四
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举一反三
【单选题】Jean left her bag in the train when she got off yesterday, but she was lucky to ______ it from the Lost and Found at the station today.
A.
catch
B.
retrieve
C.
clutch
D.
rip
【简答题】Jean left her bag in the train when she got off yesterday, but she was lucky to r_________ it from theLost and Found at the station today.
【简答题】————的物理模型称之为刚体
【单选题】Jean left her bag in the train when she got off yesterday, but she was lucky to ______ it from the Lost and Found at the station today.
A.
catch
B.
retrieve
C.
rip
D.
clutch
【简答题】刚体是一个理想化的物理模型,在任何情况下物体的大小和 不发生改变的物体可以称之为刚体。刚体的运动形式有 和定轴转动,一般情况下的运动可以分解为两种运动的合成。
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