如图是灯L和电阻R的电流随电压变化图像,电阻R的阻值为____Ω,若将他们串联接在电压为2.5V的电源两端,则电路中灯此时的电阻为____Ω.
如图所示,是某机场高速公路某路段两旁安装的隔音墙,其目的是减小车辆行驶时产生的噪声对公路两旁居民的危害。这种减小噪声危害的方法主要是在下列哪个途径中实现的 ( )
A.
B.
C.
D.
E.
F.
⑴What are you doing?____ A. She will get a present.
⑵What happened to him?____ B. He was lost.
⑶What will Jenny get?____ C. She must hurry up
⑷What must she do?____ D. I'm reading a story book.