<span><span style、" font-family: 宋体;">F一定,i相同,n越大,A越大</span></span>
<span><span style、" font-family: 宋体;">F一定,n相同,i越高,A越大</span></span>
<span><span style、" font-family: 宋体;">P一定,n相同,i越高,F越大</span></span>
<span><span style、"font-family: 宋体;">P一定,n相同,i越高,F越小</span></span>