题目内容
电容(器)是能储存磁能的元件
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电容(器)是能隔直通交 。
作为电流源来说,无论它的外电路如何变化,它的输出电流不会随着电流改变而改变。
电压源的电压或电流源的电流受电路中其它部分的电压或电流的控制的电源,简称受控源,又称独立电源。。
Statistics show that at some point in your life, you w川 get robbed. Things get even worse for apartment dwellers (居住者) because so many people pass in and out of an apartment building, and it is much(1) to keep non-residents out.So what to do? Don't panic. Yes, apartments are (2) to robbery, but there are options other than barricading yourself in your apartment with a shotgun. We suggest that you use some common sense to (3)that target from your door. Then the burglar will rob the less guarded, not you.We know what you're thinking: "I'll never get robbed. Who'd want to steal a half can of Diet Coke and an (4) toothbrush?" If those really are the only things in your apartment, you have every reason not to worry. However, if you have something you'd like to keep — say, a TV, a stereo, a computer, a Picasso — it's wise to be (5).Your goal is not to set up any (6) security systems to hold (7) at bay; your goal is to keep criminals from even trying to (8)into your apartment in the first place. If someone really wants to break in, (9) are that he/she is going to find a way by breaking a window or climbing up the fire escape. Therefore, you should remove all (10)that say, "Hey, look at me! Lots of goodies and no security! Come on in!" Lock the door when you leave. Don't leave the windows open all day long. Don't tape notes on the door directed to your mate reading "Gone all day! Left the door unlocked for you!" Just use your brains!signs cautious chances electronicsystems thieves shift liablebarriers tougher sophisticated electricuniversal threaten break
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