直线3x-5y+15=0的斜率为______，在y轴上的截距为______．_爱下问搜题

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问题填空题

直线3x-5y+15=0的斜率为______，在y轴上的截距为______．

答案

把直线变为斜截式方程得y=

3

5

x+3，

则直线的斜率为

3

5

，在y轴上的截距为3

故答案为：

3

5

，3

完形填空

Nadya Vessey, of Auckland, New Zealand, was born with an illness. So at the age of 16,    of her legs below the knees were cut off. One day when a little boy was watching _ take off her prosthetic假体的legs, he asked her     she didn't have any legs. Thinking quickly she asked him whether he had read The Little Mermaid美人鱼.He said“_     .”So Nadya told him that she was a mermaid. The Little boy was        and said,"Wow! That's so cool!” And then he ran off to tell his Dad.
The       of becoming a mermaid became clearer and clearer in Nadya's mind. After      it over, she wrote to Weta Workshop in Wellington to ask if they could      her. She never believed they actually would, so she was excited when she knew they_    _. Weta workshop's manager, Richard Taylor, was very pleased to make it true, and wanted Nadya to be _     .
It took Weta Workshop two years to make a special     for Nadya. "A prosthetic is a prosthetic, and your body has to be comfortable      it and you have to make it part of       ". After practicing in the     , Nadya went to the open sea to try on her mermaid suit. It was       amazing and great to watch Nadya swim, and to see her dream come true.
Nadya Vessey herself has written the story of a real mermaid.

A．dining hall

B．waiting room

C．living room

D．swimming pool

问答题简答题

阈下刺激时，当引起局部兴奋的两个阈下刺激的间隔很短时，有可能引起扩布性兴奋，为什么？