A、<span style="font-family: 宋体;">粘性力与惯性力</span><span style="font-family: 'Times New Roman';"> </span>
B、<span style="font-family: 宋体;">惯性力与重力</span>
C、<span style="font-family: 宋体;">压力与重力</span>
D、<span style="font-family: 宋体;">重力与粘性力</span>