题目内容
一交流接触器线圈的电阻R=100Ω，电感L=3亨，将其接在220V的工频电源上，问通过线圈的电流是多少？如果接在220V的直流电源上，此时的电流又是多少？并会出现什么后果？（如线圈的允许电流为0.5A）。
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根据下列材料，请回答题When you want to go shopping and decide how much money you call spend for new clothes，think about the kind of clothes you really need．Then look for those clothes on sale．There are labels(标签)inside all new clothes．The labels tell you how to take care of your clothes．The label for a shirt may tell you to wash it in WalTll water．Asweater label may tell you to wash by washing in cold water．The label on a coat may say“dry clean only”．Washing may ruin(毁坏)this coat．If you do as the directions say Oil the label，you call keep your clothes looking theirbest． Many clothes today must be dry-cleaned．Dry cleaning is expensive．When buying new clothes，check to see ifthey will need to be,Jry．cleaned．You will save money if you buy clothes that can be washed．You can save moneyif you buy clothes that are well-made．WeU·made clothes last longer．They look good even after they have beenwashed many times．Clothes that cost more money ale not always better made．They do not always fit better．Sometimes less expensive clothes look and fit better than more expensive ones． The first thing for you to do before you buy clothes is to read the lanes inside the clothes．
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