【单选题】【消耗次数：1】
下列指令判断若定时器T0未计满数就原地等待的是（ ）。
①
JB TF0,LP
②
JNB TF0,$
③
JNB TR0，$
④
JB TF0,$
参考答案：
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相关题目
【单选题】
用8051的定时器T0定时，用模式2，则应____。
①
启动T0前向TH0置入计数初值，TL0置0，以后每次重新计数前要重新置入计数初值
②
启动T0前向TH0、TL0置入计数初值，以后每次重新计数前要重新置入计数初值
③
启动T0前向TH0、TL0置入计数初值，以后不再置入
④
启动T0前向TH0、TL0置入相同的计数初值，以后不再置入
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8051单片机的定时器T0用作计数方式时是____。
①
由内部时钟频率定时，一个时钟周期加1
②
由内部时钟频率定时，一个机器周期加1
③
由外部计数脉冲计数，下降沿加1
④
由外部计数脉冲计数，一个机器周期加1
随机题目
【单选题】
2. When we speak to people, we should be ___.
①
as polite as possible
②
as polite as possibly
③
as politely as possible
④
as politely as possibly
【单选题】
16. The jacket was so ____ that he decided to buy it.
①
much
②
little
③
expensive
④
cheap
【单选题】
19. Your room is ____ mine.
①
twice as large
②
twice the size of
③
bigger twice than
④
as twice large as
【单选题】
4. I think the story is not so ____as that one.
①
interesting
②
interested
③
more interesting
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most interesting
【单选题】
3.This book is ____that one, but ____than that one.
①
as difficult as; expensive
②
as more difficult as; more expensive
③
as difficult as; more expensive
④
more difficult as; as expensive
【单选题】
20. Your room is ____ than mine.
①
three time big
②
three times big
③
three times bigger
④
bigger three times
【单选题】
18. The earth is about ____ as the moon.
①
as fifty time big
②
fifty times as big
③
as big fifty times
④
fifty as times big