<p style=";margin-bottom:0;text-align:justify;text-justify:inter-ideograph;line-height:150%"><span style="font-size:14px;line-height:150%">（4）普通螺纹的牙型角是</span><span style="font-size:14px;line-height:150%">（&nbsp; &nbsp;）</span></p><p style=";margin-bottom:0;text-align:justify;text-justify:inter-ideograph;line-height:150%"><br/></p><p><br/></p>

<p class="p1" style="border:0px; margin:0px 0px 1.416em; padding:0px; text-align:left; -webkit-text-stroke-width:0px"><span style="font-size:16px"><span style="text-rendering:optimizeLegibility"><span style="outline:0px"><span style="font-style:normal"><span style="font-variant:normal"><span style="font-weight:400"><span style="font-stretch:normal"><span style="line-height:1.6em !important"><span style="font-family:&quot;Songti SC&quot;"><span style="vertical-align:baseline"><span style="color:#4c4c4c"><span style="letter-spacing:normal"><span style="orphans:2"><span style="text-transform:none"><span style="white-space:normal"><span style="widows:2"><span style="word-spacing:0px"><span style="background-color:#ffffff"><span style="text-decoration-style:initial"><span style="text-decoration-color:initial"><b style="text-rendering:optimizeLegibility; font-weight:bold; margin:0px; padding:0px; border:0px; outline:0px; font-style:inherit; font-variant:inherit; font-stretch:inherit; font-size:inherit; line-height:1.4em; font-family:inherit; vertical-align:baseline">&nbsp;实践题（请根据以下给定的研究情境回答问题）</b></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p> <p class="p1" style="border:0px; margin:20px 0px 1.416em; padding:0px; text-align:left; -webkit-text-stroke-width:0px"><span style="font-size:16px"><span style="text-rendering:optimizeLegibility"><span style="outline:0px"><span style="font-style:normal"><span style="font-variant:normal"><span style="font-weight:400"><span style="font-stretch:normal"><span style="line-height:1.6em !important"><span style="font-family:&quot;Songti SC&quot;"><span style="vertical-align:baseline"><span style="color:#4c4c4c"><span style="letter-spacing:normal"><span style="orphans:2"><span style="text-transform:none"><span style="white-space:normal"><span style="widows:2"><span style="word-spacing:0px"><span style="background-color:#ffffff"><span style="text-decoration-style:initial"><span style="text-decoration-color:initial">有学者想要研究中国城市中农民工的城市定居意愿，基于对移民研究的相关文献阅读，发现对于移民的定居意愿到底是由就业与收入预期（经济动机因素）、还是他们在流入地和流出地的社会交往与融入程度（社会融入因素）决定，学者们还存在争论。基于此，学者通过对中国城市农民工的问卷调查数据来检验其定居意愿是受经济因素还是社会融入因素的影响。</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p> （1）这是一项什么类型的研究？ <p></p> <p></p>

<p style="margin-bottom:0;line-height:29px"><span style="font-family: 宋体;font-size: 16px"><span style="font-family:宋体">1、下列对居民存款储蓄的认识，正确的是（</span> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="font-family:宋体">）。</span></span></p><p><br/></p>

曲线http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/8bfdef6b09544659861527375a55979c.png与直线http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/fe37941761184d5bbd5684777c288ddc.png所围成的图形的面积（ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;）<span style="font-family: 宋体; font-size: 14px;</span><br><span style=";font-family:宋体;font-size:14px<span style="font-family:宋体</span></span><br>

<p><span style="font-family: 宋体;font-size: 16px"><span style="font-family:宋体">标志毛泽东思想开始形成的主要理论成果是</span>( &nbsp;</span><span style="font-family: 宋体;font-size: 16px">&nbsp; )</span></p><p><br/></p>