“国际标准音”在五线谱高音谱表上的位置是()
A、第一间
B、第二间
C、第三间
D、第四间
参考答案:B
Cosmic rays of various kinds come through the air from outer space, but enormous quantities of radiation from the sun are ______ off. A. avoided B. excluded C. screened D. separated
经济环境是()中最根本的组成要素。
A.生产环境
B.文化环境
C.社会环境
D.投资环境