设
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下列对关于个体手工业改造错误的是 ___________。
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()
The farmer had to wear heavy boots in the winter because the fields were too wet and________.
我国农业合作化采取的第一个步骤是 _________。
The more we looked at the picture, ________.