<p> <span>ⅲ</span>、注意延用习惯用法,拉力用<i><span>F</span></i>,摩擦力用<i><span>f</span></i>,阅卷人一看就明白,如果用反了就会有误解; </p> <p class="MsoNormal"> <span>ⅳ</span><span style="font-family:宋体;">、角标要讲究:角标的位置应当在右下角,比字母本身小许多。角标的选用要讲究,通过</span><i><span>A</span></i><span style="font-family:宋体;">点的速度用</span><i><span>v</span></i><sub><span>A</span></sub><span style="font-family:宋体;">,就比用</span><i><span>v</span></i><sub><span>1</span></sub><span style="font-family:宋体;">或者</span><i><span>v</span></i><span>′</span><span style="font-family:宋体;">好,通过同一点的速度,按时间顺序第一次用</span><i><span>v</span></i><sub><span>1</span></sub><span style="font-family:宋体;">,第二次用</span><i><span>v</span></i><sub><span>2</span></sub><span style="font-family:宋体;">就很清楚。如果反过来第一次用</span><i><span>v</span></i><sub><span>1</span></sub><span style="font-family:宋体;">,第二次用</span><i><span>v</span></i><sub><span>2</span></sub><span style="font-family:宋体;">就可能造成误解。</span> </p>
<p> <span>ⅲ</span>、注意延用习惯用法,拉力用<i><span>F</span></i>,摩擦力用<i><span>f</span></i>,阅卷人一看就明白,如果用反了就会有误解; </p> <p class="MsoNormal"> <span>ⅳ</span><span style="font-family:宋体;">、角标要讲究:角标的位置应当在右下角,比字母本身小许多。角标的选用要讲究,通过</span><i><span>A</span></i><span style="font-family:宋体;">点的速度用</span><i><span>v</span></i><sub><span>A</span></sub><span style="font-family:宋体;">,就比用</span><i><span>v</span></i><sub><span>1</span></sub><span style="font-family:宋体;">或者</span><i><span>v</span></i><span>′</span><span style="font-family:宋体;">好,通过同一点的速度,按时间顺序第一次用</span><i><span>v</span></i><sub><span>1</span></sub><span style="font-family:宋体;">,第二次用</span><i><span>v</span></i><sub><span>2</span></sub><span style="font-family:宋体;">就很清楚。如果反过来第一次用</span><i><span>v</span></i><sub><span>1</span></sub><span style="font-family:宋体;">,第二次用</span><i><span>v</span></i><sub><span>2</span></sub><span style="font-family:宋体;">就可能造成误解。</span> </p>