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【单选题】
不符合前列腺增生症的描述是A.
老年患者多见
B.
多发生于前列腺内区
C.
属癌前病变
D.
常引起排尿困难
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举一反三
【单选题】Evidence of the general consent of the international community to the existence of a rule of international law can be found in:
A.
decisions of the International Court of Justice.
B.
resolutions passed by the UN General Assembly.
C.
the conduct and practices of states in their dealings between themselves.
D.
All of the above.
【单选题】设U是某关系模式的所有属性的集合,X、Y、Z都是U的子集,且Z=U-X-Y。下面关于多值依赖的叙述中,不正确的是( )。
A.
若X→→Y，则X→→Z
B.
若X→Y，则X→→Y
C.
若X→→Y，且Y' Í Y，则X→→Y'
D.
若Z＝Ф，则X→→Y
【单选题】设 A 、 B 集合 , 若 A={ Ф } , B={ Ф , { Ф }} , 则正确的是
A.
A B 且 A B
B.
A B 且 A B
C.
A B 且 A B
D.
A B 且 A B
【单选题】设U是所有属性的集合，X、Y、Z都是U的子集，且Z=U—X—Y。下面关于多值依赖的叙述中，_______是不正确的。
A.
若X→→Y，则X→→Z
B.
若X→Y，则X→→Y
C.
若X→→Y，且Y’∈Y，则X→→Y’
D.
若Z=Ф， 则X→→Y
【单选题】The General Rule of Multiplication is used to compute:
A.
subjective probabilities.
B.
the probability of two or more mutually exclusive events.
C.
the probability of two or more dependent events.
D.
the probability of two or more independent events.
【单选题】The General Rule of Multiplication is used to compute:
A.
the probability of two or more dependent events.
B.
the probability of two or more independent events.
C.
the probability of two or more mutually exclusive events.
D.
subjective probabilities.
【单选题】The General Rule of Addition is used to compute:
A.
subjective probabilities.
B.
the probability of two or more independent events.
C.
the probability of two or more collectively exhaustive events.
D.
the probability of two events, which are not mutually exclusive.
【单选题】设U是所有属性的集合，X、Y、z都是U的子集，且=U-X-Y。下列关于多值依赖的叙述中，哪一条是不正确的?
A.
若X→→Y则X→→Z
B.
若X→Y，则X→→Y
C.
若X→→Y，且Y' Y，则X→→Y'
D.
若Z=Ф，则X→→Y
【单选题】The General Rule of Addition is used to compute:
A.
the probability of two or more independent events.
B.
the probability of two or more collectively exhaustive events.
C.
the probability of two events, which are not mutually exclusive.
D.
subjective probabilities.
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