【单选题】【消耗次数：1】
公式(P→Q)→(P→R)的成假指派为( ) (按(P, Q, R)的顺序)。
①
(0, 1, 0)
②
(1, 0, 0)
③
(1, 1, 0)
④
(1, 1, 1)
参考答案：
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相关题目
【简答题】
公式“(pú (qùr)) ? (púqúr)”的主析取范式为:[填空1]
【简答题】
用真值表判断公式“((p?q) ù (q?r)) ? (p?r)”的类型:[填空1]
【简答题】
设(70H)=60H,(60H)=20H,P1为输入口，状态为0B7H,执行如下程序：MOV R0,#70H MOV A,@R0 MOV R1,A MOV B,@R1 MOV @R0,P1 。问R0、A、R1、B和70H中的数据是多少？
【简答题】
公式“(pùq) ú (?púr)”的主合取范式为:[填空1]
【单选题】
设 R={0,10,20,31,21,32,3}，则关系R在{0,1}上的限制R?{0,1}等于：
①
{0,20,31,3
②
{1,02,03,02,13,13,2
③
{0,10,20,31,21,3
④
{2,3}.
【简答题】
设 R={0,10,20,31,21,32,3}，则关系R在{0,1}上的限制R?{0,1}等于：[填空1]
随机题目
【多选题】
简述正棱柱的作图步骤，写出作图顺序。1.作底面最能反映形状、特征的图形2.作立体最能反映形状、特征的图形3.作侧面的投影，可简化为作侧棱的投影4.作底面另两面的投影
①
1,2,3
②
1,4,3
③
2,3,4
④
2,4,3
【单选题】
带切口圆柱三视图正确的是<img src="https://file.icve.com.cn/ssykt/293/762/494BE9F27082F46369578F5E39161411.png"/>
①
<img src="https://file.icve.com.cn/ssykt/92/317/1734F413C584333E8D80BAE982C46850.png">
②
<img src="https://file.icve.com.cn/ssykt/943/633/EBE9E622E94B514C96E5A7F7C92EB4EB.png">
③
<img src="https://file.icve.com.cn/ssykt/312/811/4E2CAD5B3A1BD8950DDC8F573CA1A520.png">
④
<img src="https://file.icve.com.cn/ssykt/928/493/E807B7041A6F8E141A463904A473D616.png">
【单选题】
尺寸界限用（）绘制。
①
Normal
0
7.8 磅
0
2
false
false
false
EN-US
ZH-CN
X-NONE
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粗实线
②
细
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7.8 磅
0
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实线
③
Normal
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0
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点划线
④
Normal
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虚线