Choset’s snake robots could make more movements than the ones others developed.
A. Right
B. Wrong
C. Not mentioned
在图3.4所示并联电路中,若R=XC=XL,I=10A,则IR,IC,IL和IX各是多少?若I不变,而改变f,则U是增加还是减小?
A.on B.below C.in D.There
A. on
B. below
C. in
D. There
游乐场的溜冰滑道如下图所示,溜冰车上坡时每分钟行驶400米,下坡时每分钟行驶600米,已知溜冰车从A点到B点需要3.7分钟,从B点到A点只需要2.5分钟。AC比BC长多少米?()
A. 1200
B. 1440
C. 1600
D. 1800