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【简答题】
系统节拍定时器SysTick属于Cortex-M3内核的组件,是一个24位的( ),常用于产生100Hz的定时中断(即系统节拍定时器异常,用作嵌入式实时操作系统μC/OS-II的时钟节拍。
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】将下列命题符号化，并指出各命题的真值．
【简答题】在一阶逻辑中将下列命题符号化，并指出各命题的真值，个体域分别为：(a)自然数集合N(N中含0)；(b)整数集合Z；(c)实数集合R．
【单选题】-Yu Ting, are you _____ for the long jump? It's time to begin. -Yes, let's go. [ ]
A.
good
B.
stand
C.
ready
D.
doing
【单选题】听力原文：M: I think it's starting to snow. W: Starting to snow? Look,' the grounds are al ready white. Q: What does the woman mean? (13)
A.
It has just begun snowing.
B.
She doesn't like snowy days.
C.
It has been snowing for some time.
D.
She doesn't think it's going to snow.