【单选题】【消耗次数：1】
在频域分析中，下列那种信号作为基本输入信号来分析系统性能（）
①
正切信号
②
余弦信号
③
正弦信号
④
随机信号
参考答案：
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相关题目
随机题目
【单选题】
下列哪种方式是幼儿老师与家长谈话交往时较好的方式（ ）。
①
Normal
0
7.8 磅
0
2
false
false
false
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谈话时不涉及别的孩子，以平等的身份采用日常用语与家长交谈
②
Normal
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7.8 磅
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mso-ascii-font-family:Calibri;
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只是向家长报告孩子的优点，让家长高兴
③
Normal
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7.8 磅
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mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:宋体;
mso-fareast-theme-font:minor-fareast;
mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
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mso-bidi-theme-font:minor-bidi;
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对存在问题的孩子，向家长指出他们的教育观有问题
④
Normal
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7.8 磅
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mso-bidi-font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:宋体;
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只是向家长谈幼儿的问题，要家长注意或配合教育孩子
【单选题】
阳光中的紫外线照射到皮肤上可生成( )。
①
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②
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③
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④
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