【单选题】下列不属于光学光谱区包括的部分的是( )
【简答题】Hot money (热钱) flows around the world looking for investments that will was b high returns.
【简答题】已知角 的顶点为坐标原点,始边为 轴的正半轴,若 是角 终边上一点,且 ,则 ='________________.'
【单选题】Part I Multiple Choice Hot money flows around the world looking for investments that will _____ high returns.
【单选题】Hot money flows around the world looking for investments that will _____ high returns.
【单选题】若角 的始边为 轴的非负半轴,顶点为坐标原点,点 为其终边上一点, 则 的值为
【简答题】已知角 的顶点为坐标原点,始边为x轴的正半轴,若 是角 终边上一点,且 ,则y=_______.