A、当<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2019-01-01/1c05417f-5fc1-4c71-b557-24d64f0bdf0a.jpg" title="1.jpg" width="130" height="40" border="0" hspace="0" vspace="0" style="width:130px;height:40px;float:none;">时,必有<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2019-01-01/6a0ca0ba-e2dc-4d62-ba81-30fe77d0c9aa.jpg" title="2.jpg" width="136" height="40" border="0" hspace="0" vspace="0" style="width:136px;height:40px;float:none;">
B、当<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2019-01-01/689f6a0e-ce00-46c8-a8d2-b05a2d5bb46e.jpg" title="1.jpg" width="100" height="40" border="0" hspace="0" vspace="0" style="width:100px;height:40px;float:none;">存在时,必有<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2019-01-01/67019bbb-f704-4f4e-a784-934fa8514703.jpg" title="2.jpg" width="132" height="40" border="0" hspace="0" vspace="0" style="width:132px;height:40px;float:none;">
C、当<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2019-01-01/27061835-089b-4a00-ad3f-d5dff16d60a3.jpg" title="1.jpg" width="126" height="40" border="0" hspace="0" vspace="0" style="width:126px;height:40px;float:none;">时,必有<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2019-01-01/4c60d442-4e1f-459a-bfee-6a1396a0a985.jpg" title="2.jpg" width="131" height="45" border="0" hspace="0" vspace="0" style="width:131px;height:45px;float:none;">
D、当<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2019-01-01/61530319-ca19-49e9-8724-84b5419da869.jpg" title="3.jpg" width="99" height="45" border="0" hspace="0" vspace="0" style="width:99px;height:45px;float:none;">存在时,必有<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2019-01-01/8bd685e5-c11d-4b3f-99aa-41c402fb4b3c.jpg" title="4.jpg" width="146" height="45" border="0" hspace="0" vspace="0" style="width:146px;height:45px;float:none;">
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试题解析
采用排除法做题,取f(x)=sinx,可排除CD两项。取f(x)=sinx2/x,可排除A项 。