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     </DefaultPicUrl><Intro>第    周   星期      第    节                                       年   月   日




课题

第</Intro><SoftIntro2>第    周   星期      第    节                                       年   月   日




课题

第三节 机械效率

执教

 


教学
目标

1 知道什么是有用功、额外功和总功。
2 知道什么叫机械效率，知道计算公式，知道机械效率点小于1。
3 知道提高机械效率的意义和主要方法。


&lt;FONT s</SoftIntro2><SoftIntro>
    【内容简介】第    周   星期      第    节                                       年   月   日




课题

第三节 机械效率

执教

 


教学
目标

1 知道什么是有用功、额外功和总功。
2 知道什么叫机械效率，知道计算公式，知道机械效率点小于1。
3 知道提高机械效率的意义和主要方法。


<FONT s</SoftIntro><SoftIntroEncode>第    周   星期      第    节                                       年   月   日




课题

第三节 机械效率

执教

 


教学
目标

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&lt;TD style="BORDER-RIGHT: black 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: black 2.25pt double; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 280.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; HEIGHT: 27.25pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid black .75pt" width=374 colSpan=2&gt;
&lt;P class=MsoNormal style="MARGIN: 5pt 0cm; TEXT-ALIGN: center; mso-layout-grid-align: none" align=center&gt;&lt;SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt"&gt;&lt;FONT size=2&gt;第三节 机械效率&lt;SPAN lang=EN-US&gt;&lt;o:p&gt;&lt;/o:p&gt;&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;/TD&gt;
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&lt;TR style="HEIGHT: 72.15pt"&gt;
&lt;TD style="BORDER-RIGHT: black 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 2.25pt double; WIDTH: 36.75pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; HEIGHT: 72.15pt; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" width=49 colSpan=2&gt;
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&lt;TD style="BORDER-RIGHT: black 2.25pt double; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 415.45pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; HEIGHT: 72.15pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid black .75pt; mso-border-top-alt: solid black .75pt" vAlign=top width=554 colSpan=5&gt;
&lt;P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"&gt;&lt;SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'"&gt;&lt;FONT size=2&gt;1 知道什么是有用功、额外功和总功。&lt;o:p&gt;&lt;/o:p&gt;&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;
&lt;P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"&gt;&lt;SPAN lang=EN-US style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'"&gt;&lt;FONT size=2&gt;2 知道什么叫机械效率，知道计算公式，知道机械效率点小于1。&lt;o:p&gt;&lt;/o:p&gt;&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;
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&lt;TR style="HEIGHT: 18pt"&gt;
&lt;TD style="BORDER-RIGHT: black 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: #d4d0c8; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: black 2.25pt double; WIDTH: 36.75pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; HEIGHT: 18pt; BACKGROUND-COLOR: transparent; mso-border-top-alt: solid black .75pt" width=49 colSpan=2&gt;
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&lt;TD style="BORDER-RIGHT: black 0.75pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: black 2.25pt double; PADDING-LEFT: 5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: #d4d0c8; WIDTH: 280.8pt; PADDING-TOP: 0cm; BORDER-BOTTOM: black 0.75pt solid; HEIGHT: 27.25pt; BACKGROUND-COLOR: transparent; mso-border-left-alt: solid black .75pt" width=374 colSpan=2&gt;
&lt;P class=MsoNormal style="MARGIN: 5pt 0cm; TEXT-ALIGN: center; mso-layout-grid-align: none" align=center&gt;&lt;SPAN style="FONT-FAMILY: 宋体; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt"&gt;&lt;FONT size=2&gt;第三节 机械效率&lt;SPAN lang=EN-US&gt;&lt;o:p&gt;&lt;/o:p&gt;&lt;/SPAN&gt;&lt;/FONT&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;/TD&gt;
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