ZPW-2000R型无绝缘移频轨道电路自动闭塞,电源电压在()的范围内应可靠工作。
A、40V±1V
B、48V±1V
C、53V±1V
D、55V±2V
参考答案:B
—Mum, can we go to the art museum tomorrow?
—Sure. But first we should find out ________.[ ]
A. what can we do
B. where we can go
C. how can we go there
D. if it will be open
行于下肢内侧后缘的经脉是:()
A.足少阴肾经
B.足厥阴肝经
C.足阳明胃经
D.足太阴脾经
E.足少阳胆经