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【单选题】
保证数据库中数据及语义的正确性和有效性，是数据库的(    )。
A.
安全性    
B.
准确性
C.
完整性    
D.
共享性
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used magnetic audio ...
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【单选题】关于环层小体以下哪项正确
A.
分布于皮肤真皮乳头内
B.
感受压觉和振动觉
C.
圆形，与触觉小体大小近似
D.
有髓神经纤维穿行于中央
E.
薄层结缔组织组成被囊
查看完整题目与答案
【判断题】The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used magnetic audio ...
A.
正确
B.
错误
查看完整题目与答案
【判断题】曹魏邺城是对称的结构。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】Japan was the first ______ network operators in 2001.
A.
1G
B.
2G
C.
3G
D.
4G
查看完整题目与答案
【判断题】The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used magnetic audio ...
A.
正确
B.
错误
查看完整题目与答案
【简答题】Passage Two The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used mag...
查看完整题目与答案
【简答题】春耕时节，开发区某村用一台小型水泵抽水灌溉农田，水泵可以将水从低处抽到高处，水泵的电动机额定电压为220V，该水泵单独接在电路中正常工作30min，电能表表盘示数由2008.6kW?h变为2010.6kW?h，求： （1）水泵的电动机此时的功率是多少？ （2）水泵的电动机工作电流是多大？ （3）若水泵的电动机消耗的电能全部用来抽水，可将重为多少牛的水提升10m？
查看完整题目与答案
【单选题】What was the man's first job in Japan?
A.
He taught English at a community college.
B.
He taught the students how to cook in English
C.
He worked as a language teacher in Tokyo.
D.
He taught culinary arts at a private school
查看完整题目与答案
【判断题】The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used magnetic audio ...
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【简答题】The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used magnetic audio ...
查看完整题目与答案
【单选题】关于环层小体以下哪项正确
A.
分布于皮肤真皮乳头内
B.
感受压觉和振动觉
C.
圆形，与触觉小体大小近似
D.
有髓神经纤维穿行于中央
E.
薄层结缔组织组成被囊
查看完整题目与答案
【判断题】The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used magnetic audio ...
A.
正确
B.
错误
查看完整题目与答案
【判断题】曹魏邺城是对称的结构。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】Japan was the first ______ network operators in 2001.
A.
1G
B.
2G
C.
3G
D.
4G
查看完整题目与答案
【判断题】The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used magnetic audio ...
A.
正确
B.
错误
查看完整题目与答案
【简答题】Passage Two The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used mag...
查看完整题目与答案
【简答题】春耕时节，开发区某村用一台小型水泵抽水灌溉农田，水泵可以将水从低处抽到高处，水泵的电动机额定电压为220V，该水泵单独接在电路中正常工作30min，电能表表盘示数由2008.6kW?h变为2010.6kW?h，求： （1）水泵的电动机此时的功率是多少？ （2）水泵的电动机工作电流是多大？ （3）若水泵的电动机消耗的电能全部用来抽水，可将重为多少牛的水提升10m？
查看完整题目与答案
【单选题】What was the man's first job in Japan?
A.
He taught English at a community college.
B.
He taught the students how to cook in English
C.
He worked as a language teacher in Tokyo.
D.
He taught culinary arts at a private school
查看完整题目与答案
【判断题】The audio players of today have their roots in the Sony Walkman brand. Aside from radio devices, Sony was the first to introduce a portable music player. The first Walkman devices used magnetic audio ...
A.
正确
B.
错误
查看完整题目与答案