隋唐以后,中央机构三省六部中的三省指的是()。
A.中书省、门下省、尚书省
B.中书省、元外省、门下省
C.门下省、尚书省、元外省
D.元外省、中书省、尚书省
参考答案:A
_____ many times, he finally understood it. [ ]
A. Told
B. Telling
C. Having told
D. Having been told
远端机接收和发射光波长分别为()。
A、1550nm,1310nm
B、1310nm,1550nm
C、1550nm,1550nm
D、1310nm,1310nm