分别简述幅值、频率和初相位的基本概念。

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问题:

分别简述幅值、频率和初相位的基本概念。

考点:电能计量检定考试电能计量检定考试题库
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Do you often communicate with your parents? Some parents are always comparing their   with themselves when they were young or with other people when they were children.
"When I was your age," a father said to his sixteen-year-old son one day, "I was at the top of my class every year. And I    what I wanted to do when I left school. I had goals (目标). You are always at the bottom (最后) of your class     you have no goals."
The man's son said nothing. He had already heard this from his father many times. "And when your mother was your age, " the young man's father     , " she had a good job and she     lots of money. You don't even have a part-time job .You earn nothing. " The man's son still said nothing. He had heard this before, too. "
And when your     brother was your age, "the young man's father said, "he studied hard. But you just waste your time."
And the man's son still said nothing.
Finally, the young man's father said, "And when Abraham Lincoln was your age, he worked all day and studied at night."
This time the son     stay silent. "
And when Abraham Lincoln was your age, father," he said, "He was the President of     United States.     are you?"
His father had no answer     this.
Are your parents always comparing you with others? And what's your reply? Do you have a better way to communicate with each other?
小题1:
A.childrenB.studentsC.teachersD.friends
小题2:
A.know B.knew C.will know D.have known
小题3:
A.although B.or C.and D.but
小题4:
A.went away B.went over C.went up D.went on
小题5:
A.won B.made C.received D.gave
小题6:
A.old B.young C.older D.elder
小题7:
A.can B.can't C.could D.couldn't
小题8:
A.a B.an C.the D./
小题9:
A.What B.How C.Where D.Who
小题10:
A.to B.with C.of D.on
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一个人幻想成为另一个人,而这个人通常在他的心理上占有重要地位。这种心理现象叫【】

A.认同

B.移植

C.投射

D.回归

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某学生在距视力表5m远检查距离时右眼仍看不到最大一行视标,当其前移至距视力表3m远时始可看清该行视标,该生右眼视力为()

A.0.15

B.0.06

C.0.3

D.0.03

E.0.1

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关于既往史正确的说法包括()

A.既往史是关于患者过去疾病、外伤或健康状况的记录

B.既往史的询问特别需要注意神经病史、心肺疾病和肌肉骨骼疾病

C.了解精神病史也很重要

D.既往史对康复程序的制订有影响

E.关注既往史是因为某些过去的疾病可能会持续地影响当前的功能水平

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接缝渗漏包括堤身与堤基接触面、()、不同材料结合面等处的集中渗漏。

A.堤身与岸坡接触面

B.土石结合面

C.土与混凝土结合面

D.土与钢材结合面

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