紧缆工作须分两步进行,即()和正式紧缆。
参考答案:预紧缆
如图所示电路中,电路的电压U一定,当滑动变阻器R3的滑片向右移动时,则电流表和电压表的示数为( )
A.电流表增大,电压表增大
B.电流表减小,电压表增大
C.电流表增大,电压表减小
D.电流表减小,电压表减小
The news about the terrible flood there greatly discouraged ______ there for a sight-seeing.
A.us from going
B.us to go
C.our going
D.our to go