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【判断题】
当逻辑函数有n个变量时,共有2n个变量取值组合。
A.
正确
B.
错误
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参考解析:
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B.
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C.
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D.
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B.
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A.
careful,   carefully
B.
carefully,   careful
C.
care,   careless
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careless,   care
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A.
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B.
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C.
段落
D.
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B.
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D.
门机
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【单选题】龙门起重机又称集装箱场地( ),简称( )。
A.
装卸桥
B.
龙门吊
C.
场桥
D.
门机
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