【单选题】【消耗次数：1】
11-1. 炮弹的质量为m，其发射时的初速度为v0，发射角为q。空气阻力R设为与速度的一次方成正比，即R= -Kmv，其中m为炮弹的质量，K为常系数。将炮弹视为一质点，它在一般位置的受力图如图所示，并取图示坐标系oxy，则其质点运动微分方程为<img src=https://huaweicloudobs.ahjxjy.cn/E10EDF0ADE01ECB522404BE11F80968A.png title=QQ截图20190715141952.png alt=QQ截图20190715141952.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/D1273609A134D65500F2B93EC7131E2C.png style= title=1.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/1FFEE8F924E63D954C0FCC14B1CA7312.png title=2.png style=white-space: normal;/>
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<img src=https://huaweicloudobs.ahjxjy.cn/FD5092450F585C20C291AD9B432974D5.png title=3.png style=white-space: normal;/>
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<img src=https://huaweicloudobs.ahjxjy.cn/B26950AFD7607F43DD42E7D97FBC63BC.png title=4.png style=white-space: normal;/>
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