题干

将铭牌上分别标有“220V 60W”的灯L1和“220V 100W”的灯L2采用如图所示的电路连接后接在家庭电路的插座上,发现“60W”的L1较亮,说明L1的实际功率____ ,通过L1、L2的电流____ ;如果用一磁性较强的磁铁靠近发光的灯泡L1或L2,发现其灯丝在不停地晃动,这说明磁场对通电的钨丝有____ 的作用.

上一题 下一题 0.0难度 选择题 更新时间:2019-07-03 12:40:51

答案(点此获取答案解析)

较大,一样大,力

同类题5

任务型阅读

    Have you ever noticed how terrible weather seems to drag your spirits down?____But there are various things you can do to keep your spirits up until spring.

    ____

    A snowy, icy, cold, or rainy world can be beautiful and often has sounds and smells of its own. If you're an artist, or photographer, winter provides a great deal of inspiration and different colors to work with. Even if you don't feel that creative, simply watching a winter scene from the comfort of your home can be a pleasant way to relax and enjoy the peace.

    Take part in winter activities.

    ____ If you're a beginner to these snow sports, try learning in areas where you won't be worried about more experienced people crowding you out. Local parks are ideal starting points to encourage you to get out and give new winter sports a go.

    ____

    Winter comes with the shortest days and lowest light of the year. Go out if you can. If you can't, or if you're so far from the equator as to have little or no daylight, use bright lights and perhaps light or white walls.

    Stay active.

    As much as possible, get yourself outside. Take at least a short walk. If the weather does not permit, move around inside. Walk up and down your stairs if you have them____ It also regulates such things as sleep and diet. Move around at least a bit each day.

A. Go out.

B. Brighten up.

C. Find things to enjoy about winter.

D. Enjoy skiing, sledding, or ice-skating.

E. There's nothing you can do about the weather.

F. Making snowmen is a fun activity for both kids and adults.

G. Exercise gets your body temperature up and your blood flowing.