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一个电阻为20Ω的电铃正常工作时,两端的电压是12V,如果电铃在18V的电源上仍能正常工作1.在电路中应串联一个电路,还是并联一个电路?2.这个电阻的阻值是多少? I stayed at home for studied Math and English.什么地方错了? Peter studied for the math test yesterday (whatPeter studied for the math test yesterday (what)句型转换 I s_____ for the math test yesterday He studied for the math test ----he could pass it.A.in order to B.so to C.in order so D.so that 为什么稀硫酸蒸发后会变为浓硫酸?浓硫酸为什么不会蒸发掉? 浓硫酸是不是不易蒸发? 半导体激光治疗仪,激光二极管的供电电话是12.15V,电阻200欧,电阻两端电话分别是2.1和2.7V.半导体激光二极管电压2.1V,请问要改变什么才能让激光二极管更亮呢 锂电池充电时输出端接一个电阻,那么电阻上有电流吗,还是电流是反的? I’m tired out．I stayed up the whole night,______ for my midterm math exam．A．studying B．to study C ．to be studying D．studied这题选A,也不选to do的.有人说是因为前面有逗号隔开了,to do没有表目的的用法了,这样 My father stayed ( ) ( ) work the whole night.He is very tired now 中间两个空填什么啊 Why do you look so tired?I stayed(.)the whole nightA awake.B wake.C waking教教我吧急啊 i stayed uo the whole night,空 for my midterm test为什么空格填的是 studying 而不是 to study（表示目的啊) We stayed up the whole night=? There is no doubt that he is guilty.为什么是同位语从句It is the first time that he has been late for class 是定语从句 世界各国的人口密度各个发达国家一定要有 抗生素中,T>MIC值是什么意思,说的通俗一些. > 如何解释Time>MIC(或T>MIC)? 请问电阻是用电器吗?还有一般题目中“导体两端电压”中导体是什么?用电器可以称作导体吗? UNCLE GEORGE怎么样 Uncle George I think the photo_____by my Uncle George.A to be taken B has taken C was taken为什么不选B King George V reigns over a quarter of the world's people. 流星和彗星有什么区别? for life啥意思 a pet is for life a view(视野） for life MIC什么意思? 生活,生意,生存,谁能帮我解释一下其中的含义吗, 生存与生活我们如何来理解?生存是生活的基本,只有生存了才会有生活,生活可以很美好,就得靠自己的努力让它变的很美好,生活变的美好了生存就有了意义． 我觉得人生是有罪的最好解释我们为什么要活着当一个婴儿出生的时候他会啼哭,因为他知道等待着他面前的将是人世间许多是是非非和痛苦.我们一生有太多烦恼和苦难.当我们快要老死的时 i don't want to go there any more.为什么不能说any longer