A={x，x＜100且为质数}，在A上定义*和.如下： x*y=max(x，y)，x.y=LCM(x，y)， 这里LCM(x，y)表示x与y的最小公倍数，则下面命题正确的是()。
Ⅰ．＜A，*＞构成代数系统
Ⅱ．＜A，.＞构成代数系统
A. 只有Ⅰ
B. 只有Ⅱ
C. Ⅰ和Ⅱ
D. 没有
查看答案
下面的谓词公式是有效式的是()。
A. Ⅰ和Ⅱ
B. 只有Ⅱ
C. 只有Ⅲ
D. 只有Ⅰ
Which of the following might be the best title for the passage？
A. Left-handedness in Traditional Society
B. Left-handedness VS Right-handedness
C. Left-handedness and Violence
D. The advantage of Left-handedness in Boxing
The two doctors might support which of the following statements？
A. Left-handers stand a better chance of winning than right-handers in violence.
B. Left-handers are more likely to commit crimes than the right-handers.
C. Left-handers are directly responsible for the violence in traditional societies.
D. There is no evidence that left-handers are more violent than right-handers.
数组Q[0..n-1]作为一个环形队列，f为当前队头元素的前一位置，r为队尾元素的位置，假定队列中元素的个数总小于n，队列中元素的个数是()。
A. r-f
B. n+f-r
C. n+r-f
D. (n+r-f)modn
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