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【单选题】
CPU响应中断请求和响应DMA请求的本质区别是 ( )A.
中断响应靠软件实现
B.
速度慢
C.
控制简单
D.
响应中断时CPU仍然仍控制总线，而响应DMA请求时，CPU要让出总线
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举一反三
【判断题】While RAM memory may not be large enough to hold all of the data that a program needs, secondary storage can be arbitrarily large.
A.
正确
B.
错误
【单选题】The attitude of the Federal Bureau of Investigation shows that ______.
A.
enough data are yet to be collected from various ethnic groups to confirm the unlikelihood of two DNA samples coming from two individual members
B.
enough data of DNA samples should be collected to confirm that only DNA samples from the same person can match
C.
enough data are yet to be collected from various ethnic groups to determine the likelihood of two different DNA samples coming from the same person
D.
additional samples from various ethnic groups should be collected to determine that two DNA samples are unlikely to come from the same person
【单选题】The attitude of the Federal Bureau of Investigation shows that ______.
A.
enough data are yet to be collected from various ethnic groups to confirm the unlikelihood of two DNA samples coming from two individual members
B.
enough data of DNA samples should be collected to confirm that only DNA samples from the same person can match
C.
enough data are yet to be collected from various ethnic groups to determine the likelihood of two different DNA samples coming from the same person
D.
additional samples from various ethnic groups should be collected to determine that two DNA samples are unlikely to come from the same person 61. The National Academy of Sciences holds the stance that ______ .
【简答题】Not until enough data is collected_____________________(我们才有希望得出可靠的结论)．
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