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给你一只弹簧测力计,一个木块,几支铅笔,请你设计一个小实验,验证在相同条件下,滚动摩擦远小于滑动摩擦 我要做一个直流12伏变5伏请各位大老给个电路图...我用7805接了,无负载电压4.95伏,可电流太小,负载电压2.7伏,一个led灯都不亮,请各位大老想想办法,MC7805CTNLHB237这是我的7805型号请大佬们看看行 如何修理帐篷破损玻璃纤维帐杆 You're my fire the one desire,but we're two world apart that I can't reach to your 帐篷挂杆式和穿杆式的哪个好? 户外帐篷铝杆好还是玻杆好我觉得不管是铝的还是玻璃的质量好才是硬道理, 怎么测试玻璃纤维杆? have/take a drop in什么意思? 请问drop drop-out switch什么意思? I will be good you have to take You have to wait for hours for the plane to take off.请翻译一下 I'm Death.I have come to take you off me.为什么这里要用介词off呢 you have to get there early and wait h()for the plane to take off and it is often late根据首字母写词 at front of,at the front of,和in front of,in the front of四者之间有什么区别和联系 英语翻译状从?or... 怎么翻译这句话的意思?I am on your left,leaning www.crmcn.cn your left shoulder 英语翻译如果有相同意思不过更好的可以替换的也说下 didn't you drop it out of the car 读识光控电子开关电路 青春山大 励志起航 用英语怎么说 what do you think is the real challenge of studying at college What do you think of the english college entrance examinatian?该句怎么回答?急急—————————————————————————— have Friday afternoons offSome students should be allowed to have Friday afternoon off to volunteer and help others.off 是什么词性,在句中作什么成分? 英语情景对话 1.why do you choose this university and what do you think of you major?两人一组,每人大概6、7句.3到4分钟，每人十几句。太少啦……………… have Friday afternoons off与have Friday afternoon off有什么不同? 是have a Friday afternoons off.还是have a Friday afternoon off.?要加S吗?那 have Friday afternoons off 对吗？ Many people also take Friday off out of 的同义词是什么? out of control 的同义词组是什么 谁能给我一个触摸开断电关的开关电路?如题 谢谢了谁能给我一个12V触摸开关电路?（不要继电器自锁电路 必须是触摸接通断电关闭 ）