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【简答题】
听句子,选择与你听到的句子意思相同的选项。 (     )1. A. I bought a map because I had been there before. B. I bought a map because I knew Dalian very well. C. I bought a map because I had never been there. D. I bought a map because I liked it. (     )2. A. Jim can go to school because he is young. B. Jim can't go to school because he is too young. C. Jim isn't young and he can go to school. D. Jim is old enough to go to school. (     )3. A. My brother Tom is shorter than me. B. My brother Tom is taller than me. C. My brother Tom can get higher score than me. D. My brother Tom and I are of the same height. (     )4. A. Today we planted 10 trees. B. We are going to plant 10 more trees. C. We have planted 10 trees so far. D. We have 10 trees in our school. (     )5. A. I will go to Shenzhen by train to attend a meeting. B. I went go Shenzhen by air to attend a meeting. C. I will go to Shenzhen by air to attend a meeting. D. I have been to Shenzhen to attend a meeting.
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举一反三
【简答题】A.Beating your opponent. B.Having fun. C.Doing your best to show your talent. D.Having award and reputation.
【单选题】海明码是一种()。
A.
检错码
B.
语音编码
C.
压缩编码
D.
纠错码
【简答题】( )是指收款人委托银行向付款人收取款项的结算方式。
【判断题】双子叶植物的叶脉大多数属于网状脉。
A.
正确
B.
错误
【单选题】海明码是一种纠错码,一对有效码字之间的海明距离是()。
A.
两个码字的比特数之和
B.
两个码字的比特数之差
C.
两个码字之间相同的比特数
D.
两个码字之间不同的比特数
【单选题】海明码是一种常用的纠错码。如果被校数据是k位二进制数,再增加若干位校验位,使得校验位的值决定于某些被校位数据,当被校数据出错时,可根据校验位值的变化找到出错位,进而纠正出错位。若新增校验位为r位,则校验位之位数与被校验数据之位数应满足(3)。由校验位和被校验位数据逐位异或可得到海明校验值,如果各位海明校验值均为零,表示(4)。
A.
2r≥k+r
B.
2r≥k+r+1
C.
2k≥k+r+1
D.
2r≥k+r
【单选题】海明码是一种___。
A.
检错码
B.
纠错码
C.
操作码
D.
地址码
【多选题】双子叶植物叶片的叶脉中维管束( )。
A.
属于有限维管束
B.
属于无限维管束
C.
有束中形成层
D.
无束中形成层
【多选题】属于双子叶植物的特征的是
A.
直根系
B.
网状脉
C.
茎有木本、草本;维管束具有形成层
D.
三基数花, 花粉粒具有单纹孔
【单选题】下列有关原生动物叙述错误的是?
A.
变形虫可进行胞饮作用
B.
原生动物也有有性生殖的方式,主要是接合生殖和配子生殖
C.
原生动物的分裂生殖的细胞分裂方式是无丝分裂
D.
原生动物的寄生种类行渗透性营养
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