试题与答案

水力发电是间接利用太阳能.在回答太阳能如何转化为电能的问题时用到下面的5句话:

题型:选择题

题目:

水力发电是间接利用太阳能.在回答太阳能如何转化为电能的问题时用到下面的5句话:

①水蒸气经过液化、凝华等物态变化;

②太阳向空间辐射热使江河湖泊中的水蒸发;

③形成水位差;

④以雨、雪等形式落回大地;

⑤发电机将水的势能转化为电能.

合理的表达顺序应为(  )

A.②①④③⑤

B.①④②③⑤

C.②③①④⑤

D.②④①③⑤

答案:

答案:A

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题型:单项选择题

______in the strength of the carrier signal is varied to represent binary 1 or 0.()is a system that can map a name to an address and conversely an address to an name.______is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol______is an approach that enables an ATM Switch to behave like a LAN switch.______is an guided media which is made of glass or plastic and transmits signals in the form of light.

A.NAT 

B.NCP 

C.DDN

D.DNS

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