Features a 4-0z.kettle and a cycle time of approximately 2-1/2 minutes.a 4-0z.kettle是什么的缩写?2-1/2 minutes呢?

Features a 4-0z.kettle and a cycle time of approximately 2-1/2 minutes.a 4-0z.kettle是什么的缩写?2-1/2 minutes呢? Features features a woman with regular features是什么意思? 日本kett谷物水分测量仪价格是多少 register features是什么意思? eg. A study on the register features in translation of international the formal living features a bay window是什么意思 what are three important features of a modern economy cascading upward through a chain of turbulent features 共轭复数的问题虚数z满足z+4/z=a,a为实数求|z|书上有种解法是这样的 可是我看不懂是不是有某种性质啊?∵z+4/z属于R∴z轭+4/z=z轭+4/z轭∴（z-z轭））（1-4/|z|^2）=0∴|z|=2怎么得出的是不是共轭有 已知非零复数z满足|z-2|=2,z+4/z∈R,求z.我的做法为啥错呢?我的做法如下：∵|z-2|^2=4∴（z-2）·（z拔-2）=4∴|z|^2=8=z·z拔∴z拔/2=4/z∴z+4/z=z+z拔/2=a+bi+a/2-bi/2∴b=0 a=2根号2z=1±√3i features是什么意思? features是什么意思 features意思 帮我看看这道题!拉氏变换到z变换show briefly how the following s-plane features map into the z-plane and explain the significance of the results in each case:(1) a line of constant damping ratio;(2) an infinite strip in the left hand half |Z| +4Z+i=0,求复数Z 求(z-a)/(z+a)(a>0)展开成z的幂级数, 第一题 x-3y+2z=0 ,3x-3y-4z=0 ,求 x:y:z= 第二题 2x+3y-4z=0 ,3x+4y+5z=0,求 x+y+z/x-y+z = 第三题 x+y=3a ,y+z=5a ,z+x=4a ,x-2y+3z=-10 ,求 a=