1) There is a big misconception that organic farms cannot use any pesticides. 2) Organic farmers can use both synthetic and natural kinds of pesticides, but some of the regular pesticide chemicals ______ from organic farms. 3) As fewer chemical pesticides are used, there is less risk of chemicals remaining in the food, which can be ______ for consumers.
1) There is a big misconception that organic farms cannot use any pesticides. 2) Organic farmers can use both synthetic and natural kinds of pesticides, but some of the regular pesticide chemicals ______ from organic farms. 3) As fewer chemical pesticides are used, there is less risk of chemicals remaining in the food, which can be ______ for consumers.
设矩阵$A= 1 -1 2 3 $，
、液压传动装置由( )、( )、( )、( )和(
Complete the sentences with the correct form of the expressions given below.at t
化简：(1)$\sqrt{4+2\sqrt{3}}$= .(2)$\sqrt{5-2\sqrt{6}}$= . 化简：(1)$\sqrt{4+2\sqrt{
计算下列极限: (1);(2); (3). 计算下列极限: (1);(2); (3).
设Z1,Z2,Z3三点适合条件：Z1+Z2+Z3=0及|Z1|=|Z2|=|Z3|=1试证明Z1.Z2.Z3是内接于单位圆周|Z|=1的 正三角形的顶点.
新车保护蜡就是新车蜡。( )... 新车保护蜡就是新车蜡。( )...