设曲线 L:f(x,y)=1(f(x,y) 具有一阶连续偏导数 ) ，过第II 象限内的点M和第IV象限内的点N，T为L上从点M到点N的一段弧，则下列小于零的是（）
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591421212239875.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591421218216187.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591421225802518.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591421231311768.png" />
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正确答案： B 答案分析：img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606132729_23787.png" alt="" />
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