为什么采用硅整流作变电站的直流操作电源?
参考答案:硅整流直流操作电源具有质量高、输出容量大、速度快、运行稳定可靠、维护方便、投资省等优点,故在变电站中被广泛采用。
— Are you still very busy?
— Yes, I _____ the report for the manager and it won't take long. [ ]
A. have just finished
B. am just finishing
C. had just finished
D. will just finish
"可按可摩,时兼而用,通谓之按摩。"此语出自()
A.《黄帝内经》
B.《医宗金鉴》
C.《圣济总录》
D.《厘正按摩要术》