下列函数在区间<img alt="" height="21" src="/api/uploads/1537890/in-rich-contentcreated_at=1647290540" width="61">上是单调下降的是（　　）。(单选题)<br>.<img alt="\"\"" height="\"19\"" src="\"/api/uploads/1537894/in-rich-contentcreated_at=1647290540\"" width="\"36\"">.,.<br><img alt="\"\"" height="\"21\"" src="\"/api/uploads/1537893/in-rich-contentcreated_at=1647290540\"" width="\"19\"">.,.<br><img alt="\"\"" height="\"21\"" src="\"/api/uploads/1537892/in-rich-contentcreated_at=1647290540\"" width="\"19\"">.,.<br><img alt="\"\"" height="\"19\"" src="\"/api/uploads/1537891/in-rich-contentcreated_at=1647290540\"" width="\"35\"">

下列函数在区间<img alt="" height="21" src="/api/uploads/1537890/in-rich-contentcreated_at=1647290540" width="61">上是单调下降的是（　　）。(单选题)
.<img alt="\"\"" height="\"19\"" src="\"/api/uploads/1537894/in-rich-contentcreated_at=1647290540\"" width="\"36\"">.,.
<img alt="\"\"" height="\"21\"" src="\"/api/uploads/1537893/in-rich-contentcreated_at=1647290540\"" width="\"19\"">.,.
<img alt="\"\"" height="\"21\"" src="\"/api/uploads/1537892/in-rich-contentcreated_at=1647290540\"" width="\"19\"">.,.
<img alt="\"\"" height="\"19\"" src="\"/api/uploads/1537891/in-rich-contentcreated_at=1647290540\"" width="\"35\"">

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