冬虫夏草
参考答案:
解析:21(12119016)
_____ your attention focused on practicing, and you can reach your goal of becoming an excellent pianist.
A.Keep
B.Keeping
C.To keep
D.If you keep
电炉倾动机构(EBT炉除外)应使炉体向炉门方向能倾动()度,以便于扒渣等操作。
A.30°
B.10°~15°
C.45°~45°