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【判断题】
在时间上和数值上离散的信号称为数字信号。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】By saying 'life has a way of throwing these curve balls at us', the author means ______.
A.
life is full of miseries and misfortunes
B.
things and people that you feel so comfortable with do not last for good and are destined to change
C.
life is full of changes and these changes cannot be avoided
D.
life is full of surprises
【单选题】法国大革命中颁布的体现反对封建专制和封建等级制度思想的文件是( )
A.
、 《 权利法案 》
B.
、 《 人权宣言 》
C.
、 《 独立宣言 》
D.
、 《 法典 》
【单选题】在web程序中,cookie和session的信息保存位置分别在哪里? ( )
A.
cookie保存在客户端,session保存在服务器端
B.
cookie和session都保存在客户端
C.
cookie和session都保存在服务器端
D.
cookie保存在服务器端,session保存在客户端
【单选题】What the author mainly intends to tell us is that ______.
A.
one's sleeping position has something to do with one's character
B.
everyone has got both real and secret personalities
C.
the position in which one goes to sleep is the most important one
D.
when awake, one does not show one's secret personality
【单选题】In this passage, the author mainly tells us ______
A.
everyone has bad memories sometimes no matter how old he is
B.
we can prevent our mind from aging with various methods
C.
brain aging starts at the time when we are in the 20s and 30s
D.
memory loss is not the sign that we are getting old
【简答题】while 语句的特点是( ),do-while语句的特点是( )。
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