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【单选题】
下列肝硬化声像图表现中,正确的是:()A.
肝回声增高、增粗、分布不均
B.
肝表面不平
C.
尾状叶增大
D.
门静脉增宽和肝静脉变细
E.
以上均有可能
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举一反三
【单选题】No matter how busy he is, he makes _____a rule to surf the Internet for information.
A.
him
B.
this
C.
that
D.
it
【单选题】Why is the flow of information between the two halves of a man's brain more restricted than that of a woman's?
A.
Because there are more nerves connected the two sides of a woman's brain.
B.
Because there are more nerve cells in a woman's brain.
C.
Because there are more barriers between the two sides of a man's brain.
D.
Because men are influenced by their other abilities.
【单选题】Using many symbols makes ______ to put much information on a single map.
A.
possible
B.
it possible
C.
that possible
D.
it is possible
【单选题】When you pass information onto your brain, for a boy ______.
A.
you get more information than a girl
B.
you get less information than a girl
C.
you collect information faster than a girl
D.
you collect information more slowly than a girl
【单选题】下列说法正确的是
A.
一个信号不是能量信号就是功率信号
B.
一个信号有可能既是能量信号又是功率信号
C.
一个信号可能既不是能量信号也不是功率信号
D.
以上说法都不对
【单选题】以下叙述错误的是（ ）
A.
一个信号不可能既是能量信号，也是功率信号
B.
所有数字信号都是离散信号
C.
正弦序列不一定是周期序列
D.
数字信号的幅度只能取 0 或 1
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