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【单选题】
以下不属于第1代计算机特点的是( )A.
其基本元件是电子管
B.
时间段是1946~1966年
C.
用机器语言编程
D.
主要应用于军事目的和科学研究
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反馈参考答案：
举一反三
【单选题】在一个E-R图中，如果共有20个不同实体类型，在这些实体类型之间存在着9个不同的二元联系(二元联系是指两个实体之间的联系)其中3个是1:n联系，6个是m:n联系，还存在1个m:n的三元联系，那么根据E-R模型转换成关系模型的规则，这个E-R结构转换成的关系模型个数为
A.
20
B.
27
C.
30
D.
36
【单选题】妊娠母猪咳嗽，发热，继而流产。取流产胎儿脑组织接种兔，兔出现奇痒后死亡。该病最可能是
A.
猪瘟病毒
B.
猪圆环病毒
C.
猪细小病毒
D.
伪狂犬病毒
E.
猪繁殖与呼吸综合征病毒
【单选题】Our teacher asked me ________.
A.
what was Ann doing these days
B.
why didn’t Peter come to school the day before
C.
when will the dolphin show begin
D.
how long I usually spent on my homework
【单选题】The loud noise outside ______ our teacher’s voice so that we didn’t ______ what he was saying. [ ]
A.
put out; hear
B.
drowned; make out
C.
cut out; recognize
D.
threw away; know
【简答题】在E-R模型中,实体之间的联系类型有________、________和________。
【单选题】Without our teacher's help, we ______ so much.
A.
didn't achieve
B.
will not achieve
C.
don't achieve
D.
would not have achieved
【单选题】Our teacher asked me ________. [ ]
A.
what was Ann doing these days
B.
why Peter didn’t come to school the day before
C.
when will the dolphin show begin
D.
how long I usually spent on my homework
【单选题】i didn’t like our new english teacher, and ____.
A.
neither did my classmates
B.
neither my classmates did
C.
my classmates don’t too
D.
my classmates did not also
【单选题】I didn’t like our new English teacher, and ____.
A.
neither did my classmates
B.
neither my classmates did
C.
my classmates don't too
D.
my classmates did not also
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