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【单选题】
在数据库设计过程中,实体属性对应的数据字典条目是( )A.
数据结构
B.
数据流
C.
数据存储
D.
数据项
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举一反三
【单选题】甲药比乙药安全的依据是
A.
甲药的LD 50 比乙药大
B.
甲药的LD 50 比乙药小
C.
甲药的LD 50 /ED 50 比乙药大
D.
甲药的LD 50 /ED 50 比乙药小
E.
以上均不是
【单选题】完成下列各选项 Expressing gratitude is an important form. of good manners． Nowadays more and more people in China have found it s high time to 11 a thankful heart for the young． Everyone likes to get praised...
A.
have
B.
cultivate
C.
share
D.
like
【简答题】More -agers smoke today than at any time since the 19 15 s, a federal study shows. Overall, 35% of children 1 grades 9-12 smoke cigarettes, a greater 2 than the 25% of s who smoke. 3 it is il...
【单选题】The average time between two high waters is 12 hours and 25 minutes because this is the time it takes for ____.
A.
The sun to be at the opposite side of the moon
B.
The moon to be at the opposite side of the earth
C.
The moon to be at its apogee
D.
The sun and the moon to be on the same side
【简答题】Dịch các câu sau đây ra tiếng Hán. (1) Màu xanh mướt của tre có lúc xòa mát khoảng trời trên đầu. Trên đường làng, lúc gió nhiều, những chiếc lá tre rụng xuống quấn chân người đi. (2) Cộng đồng xúm và...
【单选题】The average time between two high waters is 12 hours and 25 minutes because this is the time it takes for (A).
A.
the moon to be at the opposite side of the earth
B.
the sun and the moon to be on the same side
C.
the moon to be at its apogee( 远地点 )
D.
the sun to be at the opposite side of the moon
【单选题】The average time between two high waters is 12 hours and 25 minutes because this is the time it takes for ___ .
A.
the Sun to be at the opposite side of the Moon
B.
the Moon to be at the opposite side of the Earth
C.
the Moon to be at its apogee
D.
the Sun and the Moon to be on the same side
【单选题】按照自然顺序的十进制数0,1,2,3,4,5,6,7,其十进制倒位序为____________。
A.
7,6,5,4,3,2,1,0
B.
0,4,2,6,1,5,3,7
C.
0,2,4,6,1,3,5,7
D.
7,5,3,1,6,4,2,0
【单选题】It is high time that they ____ the war on Iraq .
A.
stop
B.
stopped
C.
must stop
D.
has stopped
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