【单选题】【消耗次数：1】
设A和B皆为n阶实方阵，则下面论断错误的是()。
①
<SPANstyle="FONT-SIZE:10.5pt；FONT-FAMILY:宋体；mso-bidi-font-size:12.0pt；mso-font-kerning:1.0pt；mso-ansi-language:EN-US；mso-fareast-language:ZH-CN；mso-bidi-language:AR-SA；mso-ascii-font-family:TimesNewRoman；mso-hansi-font-family:TimesNewRoman；mso-bidi-font-family:TimesNewRoman">A与B</SPAN><SPANlang=EN-USstyle="FONT-SIZE:10.5pt；FONT-FAMILY:TimesNewRoman；mso-bidi-font-size:12.0pt；mso-fareast-font-family:宋体；mso-font-kerning:1.0pt；mso-ansi-language:EN-US；mso-fareast-language:ZH-CN；mso-bidi-language:AR-SA"><SPANstyle="POSITION:relative；TOP:2pt；mso-text-raise:-2.0pt"></SPAN></SPAN><SPANstyle="FONT-SIZE:10.5pt；FONT-FAMILY:宋体；mso-bidi-font-size:12.0pt；mso-font-kerning:1.0pt；mso-ansi-language:EN-US；mso-fareast-language:ZH-CN；mso-bidi-language:AR-SA；mso-ascii-font-family:TimesNewRoman；mso-hansi-font-family:TimesNewRoman；mso-bidi-font-family:TimesNewRoman">相似的充要条件是存在可逆阵P</SPAN><SPANstyle="FONT-SIZE:10.5pt；FONT-FAMILY:宋体；mso-bidi-font-size:12.0pt；mso-font-kerning:1.0pt；mso-ansi-language:EN-US；mso-fareast-language:ZH-CN；mso-bidi-language:AR-SA；mso-ascii-font-family:TimesNewRoman；mso-hansi-font-family:TimesNewRoman；mso-bidi-font-family:TimesNewRoman">，使得A=P<SUP>-1</SUP>BP</SPAN>
②
若A是反对称矩阵，则A<SUP>T</SUP>=-A</P>
③
若A可逆，则A可以表示成若干个初等矩阵的乘积
④
若A是正交矩阵，则|A|=1
参考答案：
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①
NH3水
②
HCl
③
H2O
④
Na2SO4
【单选题】
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①
应旋转后投影
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③
不旋转直接投影
④
旋转后用虚线表示其投影
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①
一个剖切平面
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两个相交的剖切平面
③
两个剖切平面
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几个平行的剖切平面
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NaAc
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NH4Cl
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KNO3
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H2S
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必要的尺寸标注
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设备示意图
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流程管线及流向箭头
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必要文字注解
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正确
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错误
【单选题】
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①
视图的轮廓线以外
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剖切位置线的延长线上
③
视图轮廓线以内
④
按投影关系配置
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理论与实践；关于设计、开发、利用；关于管理和评价；关于过程与资源
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理论与实践；关于设计、开发、利．用；关于管理和评价；为了促进学习
④
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④
教育技术是微观层次的教学实践 ，