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【多选题】
数据的基本模型有( )。A.
结构模型
B.
网状模型
C.
层次模型
D.
关系模型
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】We can infer that among the four synonyms listed below, ______ is the best replacement for the word 'proceed' as used in Paragraph 3.
A.
advance
B.
carry on
C.
keep
D.
work
【单选题】Which of the motors for the devices listed below is fitted with an instantaneous overload relay?
A.
Fan
B.
Pump
C.
Winch
D.
Machine tool
【单选题】The author mentions all of the risks listed below except ______ .
A.
the decreases in natural habitats such as wetland and forest
B.
the persistent flooding will endanger the coastal wetlands
C.
species which are unable to migrate will face extinction
D.
the big temperature changes are likely to cause epidemics
【单选题】According to the passage, all the damage listed below could be done by a hacker EXCEPT ______.
A.
entering into computers illegally
B.
creating many electronic-age terms
C.
removing computer systems
D.
going through computer systems
【简答题】用集成计数器CT74160结合反馈复位法实现二十四进制计数器。
【简答题】试用两片CT74LS293计数器设计一个二十四进制计数器。
【简答题】用74LS161来构成一个二十四进制计数器。
【简答题】试用两片74LS290型计数器接成二十四进制计数器。
【简答题】试用两片74LS293型计数器接成二十四进制计数器。
【单选题】由 4个JK触发器组成的计数器可进行..........................................( ) 1八进制计数 2九进制计数 3十二进制计数 4十六进制计数 5十八进制计数 6二十四进制计数
A.
①③⑤
B.
②④⑥
C.
①⑤⑥
D.
②③④
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