【单选题】如果命题“曲线C上的点的坐标都是方程f(x,y)=0的解”是正确的,则下列命题中正确的是( )
B.
方程f(x,y)=0的每一组解对应的点都在曲线C上
C.
不满足方程f(x,y)=0的点(x,y)不在曲线C上
【单选题】若命题“曲线 C 上的点的坐标满足方程 f ( x , y )=0”是正确的,则下列命题中正确的是
A.
方程 f ( x , y )=0表示的曲线一定是曲线 C
B.
坐标满足方程 f ( x , y )=0的点一定在曲线 C 上
C.
方程 f ( x , y )=0表示的曲线不一定是曲线 C
D.
曲线 C 是坐标满足方程 f ( x , y )=0的点的轨迹
【简答题】It’s Monday again today, and I _(work) as usual. I _(sit) here in the office for the last two hours but I _(not do) much work yet. I (feel) to fed up to work. I _(already have) my holiday this year. I...
【简答题】The sun shines brightly as I leave school, get into my car, and head for Bradley Hospital. This year, as a senior at Seekonk High School, I have been given the opportunity to leave the usual classroom...
【判断题】应尽量避免加强筋局部集中,筋的排列要顺着在型腔内的流动方向。
【单选题】关于水平思考和垂直思考之间差异性,下列说法错误的是( )
【简答题】The temperature here used to be 27c on average, but it is (usual) ______ hot this year, for the temperature has reached as high as 35c .
【简答题】阅读理解。 The New Year is coming and as usual there are great hopes, dreams and resolutions to make. However, I will stop hoping and dreaming this time and make the resolutions only. First of all, I'm goi...