SDR基站单板在正常运行状态下,RUN指示灯的指示为()。
A、常亮
B、1Hz闪
C、5Hz闪
D、灭
参考答案:B
Is this cake _________ your mother? [ ]
A. is made of
B. is made by
C. made of
D. made by
美国联邦政府由哪三个相对独立的部门组成()①立法②行政③司法④考试⑤监察
A.①②⑤
B.①②③
C.②③⑤
D.③④⑤