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【简答题】
手术病人一般在术前 12h 开始禁食， 4h 开始禁饮的理由是 A ．让胃肠道适当休息 B ．防止在麻醉或手术过程中发生呕吐 C ．减少穿肠道手术时的污染 D ．防止术后腹胀 E ．减少术后排便
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【单选题】离散信源输出五个不同符号，若各符号概率分别为1/2、1/4、1/8、1/16、1/16，则该信源的熵为（ ）。
A.
1.5bit/符号
B.
2bit/符号
C.
1bit/符号
D.
1.875bit/符号
【简答题】Mrs. Black was a famous musician a few years ago. She 1 music at a school and her students did well in their lessons. They liked her very much. Now the old woman stays at home with her husband. The ol...
【单选题】离散信源输出五个不同符号,若各符号概率分别为 1/2,1/4,1/8,1/16, 1/16 ,则该信源的熵为多少( )。
A.
1.5bit/ 符号
B.
1.875 bit/ 符号
C.
2 bit/ 符号
D.
1 bit/ 符号
【单选题】The famous writer as well as his wife and daughter_____said to______our party，but so far they____
A.
26．The famous writer as well as his wife and daughter_____said to______our party，but so far they_____． A．are；have attended；don’t turn up
B.
is；have attended；haven’t turned
C.
is；attend；haven’t turned up
D.
are；attend；don’t turn up
【单选题】离散信源输出五个不同符号,若各符号概率分别为 1/2 , 1/4 , 1/8 , 1/16 , 1/16 ,则该信源的熵为()。
A.
1.875bit/符号
B.
1.5bit/符号
C.
1.25bit/符号
D.
1.75bit/符号
【简答题】听下面一段话，回答1-2题。 1. Who is 'Mr. Rice Guy'? A. A famous cook. B. An actor C. A dancer. 2.What can we learn about 'Mr. Rice Guy'? A. He is good at cooking. B. He likes watching dinnertime show. C. He is l...
【简答题】一齿数z为25的直齿圆柱齿轮的分度圆直径d为100,则该齿轮的齿顶高为____mm,齿根高为______mm,全齿高为______mm.
【单选题】离散信源输出五个不同符号,若各符号概率分别为1/2,1/4,1/8,1/16,1/16,则该信源的熵为( )
A.
1.5bit/符号
B.
1.875 bit/符号
C.
2 bit/符号
D.
1 bit/符号
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