如图1所示，已知小灯泡L上标有“6V 3W”字样，R0=20Ω，滑动变阻器R的最大阻值为100Ω．求：
图1 图2
The team will move a speed of 15 kilometers per hour, and have a short break every 2 hours. During the break they will tell stories_______ English.
能保持水的化学性质的粒子是（ ）
