碱性中药与
A.青霉素B.四环素C.红霉素D.丝裂霉素CE.链霉素可以有协同作用的中药
参考答案:C
平面直角坐标系中,已知B(-2,0)关于y轴的对称点为B′,从A(2,4)点发出一束光线,经过y轴反射后穿过B′点.此光线在y轴上的入射点的坐标是______.
New Zealand has two islands(岛屿). One is North Island and _________ is South Island. [ ]
A. another
B. the other
C. other
D. the others