A、<img width="116" height="19" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/ec52c4b7-3e97-41cd-a975-4d8c5c45c341.png" alt="说明:HWOCRTEMP_ROC27910">
B、<img width="77" height="16" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/86ab7114-0d37-4fdd-a0c4-6ce95905437b.png" alt="说明:HWOCRTEMP_ROC27920">
C、<img width="67" height="31" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/06edcfee-f1f4-4258-bdcb-f8712be9057a.png" alt="说明:HWOCRTEMP_ROC27930">
D、<img width="72" height="16" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-08-09/8a8f9d90-305e-4ce0-9dc1-04c46c93e99b.png" alt="说明:HWOCRTEMP_ROC27940">
A、<img width="104" height="17" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/25dcc72e-3bbb-4638-a93c-74f52b7c07f1.png" alt="说明:HWOCRTEMP_ROC27910">
B、<img width="77" height="16" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/70247eb7-4435-45c7-a4c2-906741b9a173.png" alt="说明:HWOCRTEMP_ROC27920">
C、<img width="64" height="28" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/5ff2f479-c256-4ca6-aaeb-fe6ba9863907.png" alt="说明:HWOCRTEMP_ROC27930">
D、<img width="68" height="15" src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2016-09-01/fb969f3b-91e0-463a-9226-10774f866c44.png" alt="说明:HWOCRTEMP_ROC27940">
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试题解析
A项,
在x≤0时无意义;B项,当x=1时,
;C项,当x<0时,
;D项,
对任意x恒成立.