幽默三分钟英语脱口秀

Pauline is a _______ secretary .She often makes some mistakes in her work.(care) R1和R2串联后接在电压5V电源上,通过R1电流强度是0.3A,R2两端的电压是,求R1和R2各多少 为什么酸酐的酯化更加容易酚羟基的酯化相对比较难,原因是酚羟基的空间位阻大,需要和酸酐才能酯化,比如乙酸酐,乙酸酐就是两个乙酸分子脱去一分子水得到的物质,（CH3CO)O(CH3CO),谁能从酯 Never believe anything ______any other person has believed it.Use your own head用that还是because 为什么不是定语从句 翻译 Such a person never bump into other people 黄历上冲马子午相冲是什么意思 子午相冲什么意思? 子午真的相冲吗?有没有子午成功的一对? 王锷散财货的意思 子午为什么相冲? 等长、等张肌肉收缩的名词解释 翻译：We firmly believe that war can not settle anything. it 是什么? 斜角肌间隙在颈部的哪个区?其构成?内容物? 什么是斜角肌间隙 斜角肌间隙及通行结构拜托各位了 3Q 斜角肌间隙由什么围成 已知某导体的电阻是20欧,升高他两端的电压,什么随着增大,他的电阻是多少接着上题：如此导体两端无电压,则导体两段电流为0,这时他的电阻是多少（不考虑温度的影响）我还没有学到欧姆 五旬节怎么样 五旬节是什么意思?怎么理解 关于英语语音学的问题,tone 定义是什么呢?tone unit的四大要素,nucleus,tail,head,prehead能不能举个例子啊?这样似乎很抽象 English unit summary newspaper" 关于地址的英文我不懂Stockton BIvd,Unit(Ste)4是什么意思啊书写是BIvd还是Bivd啊, I played games with my brother at 9:00是否能改写为这样的强调句 It was i with my brother that played games at 9:00 It was with my brother that I played games at 9:00 请说明原因, 英语翻译 有关月球的文章有关月球的作文 abnormal 为什么用cost per unit计量 inspection absorbance In winter,people usually keep fires in their houses to_______them against the cold.In winter,people usually keep fires in their houses to_______them against the cold.A.produceB.protectC.provideD.prevent急 电动机单相电流为什么比额定电流小 550W单相电机额定电流是多少?是不是550/220/0.78=3.2A