题目内容
电阻元件的伏安特性是过原点的一条直线，该电阻称为线性电阻。（）
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电路中选取参考点变了，各点的电位就变了。（）
电压是绝对的，电位是相对的。（）
电容是储能元件，将电能转化为电场能，但电场能不能转化为电能。（）
Statistics show that at some point in your life, you will get robbed. Things get even worse for apartment dwellers (居住者) because so many people pa8sS 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 electronic systems thieves shiftliable barriers tougher sophisticated electric universal threatenbreak)
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